I thought I'd add my recent experiences to this thread... (warning: it's a long read!). My requirements were for a portable 400MhZ (or better) SatNav device with up to date UK maps & free speed camera database, that's inutitive, easy to read and use.
1. First off was actually an impulse-buy while I was food/fuel shopping in Tesco's - Becker Traffic Assist - was the last one the shelf, £79.99 with UK, Ire & European maps on a 2GB SD card & CD! I asked if it gives speed camera alerts but the assistant couldn't help. She did remind me that if I didn't like it I could get a full refund within 21 days, so the deal was done!
Talk about German engineering! It's a robust, large display unit with quality stereo speakers (1Wx2) very easy to use, intuitive and offered both MP3 & photo players. The spoken directions were very clear, prompt and with a nice natural voice. Apparently it does support speed alerts of some kind (not necessary speed cameras?) but there's a get-out clause about "depending on country" or something daft like that. Either way, it did not alert me to any cameras and there were no relative menus to configure - which was the reason I stated to get my refund.
2. Money back in my pocket, I saw a ViaMichelin X960 in Maplins for the same price and bought it due to it boasting speed camera alerts with free updates for life. In short, you get a fantastic range of Michelin's guides built-in to the Points of Interest categories but only covering UK & Ire (unless you pay another £30). Absolutely amazing amount of information about the best places to stay, eat, visit etc, etc, etc. There's even more functionality if you combine it with the complimentary website (see ViaMichelin.com for an idea) - too much to recall & list here. The SatNav was a noticeably smaller display (3.5in) and less intuitive than the Becker but pretty straight forward to use. What I didn't like was the cradle arrangement, very fiddly to setup and unnecessary awkward to remove (for when parking in chav territory). After several days playing with it I found it had a "motorway mode" which adapts for high speed driving very well. Additionally, you can set speed warning thresholds for all roads (i.e. warn me when over the speed limit; but see problem below) as well as giving alerts for fixed speed cameras so I was pretty impressed with this little unit. However, it had no MP3 or photo capability (yet it shows Michelin's Green Guide photos! And you can even create your own on-screen icons for your "favourite places" (POI) which caused me to giggle to myself as I thought of the possibilties!
) What made me decide to take it back for a refund was the constant nagging of speeding when I was clearly under the limit! i.e. When I reached 37mph in a 40mph zone I got nagged. Ditto for 38/39/40+ etc. I soon began to suspect the unit classed all single-lane roads as 30mph limits as even in a 50 limit I was being nagged at 37+mph. I called tech-support and they told me it was a bug that should be fixed with the next update but were unable to tell me when this would be.
3. So I took my money next door to Halfords where I had a choice of two other SatNavs for £10 less
The LG N10 and the Navman F10. Both had claimed to have speed cameras but the Navman stated you pay thereafter £40 per year!
So I went for the LG. This SatNav was not so good. It didn't recognise my postcode (the other two did) and the touchscreen menu "hung" for about 5 minutes every time you entered a postcode it didn't know (even my local DVLA office wasn't there). It was obvious this SatNav's map was inaccurate rather than outdated. Additionally, although it gave speed camera alerts, the speed camera menu was ghosted out and unavailable
And the voice!!
It was synthesised! And with poor punctation to boot!! i.e "At the roundabout, follow the.....roundabout. Second exit." and then, as you got onto the roundabout it repeats..."Follow the......roundabout. Second exit"
Anyway, I kept it for a while as Halfords have a 30-day return policy giving me some time to play with it before returning it to take the Navman for a test-drive
But that was my downfall. When I returned to Halfords, they asked if I'd like another model (suggesting a Tom-Tom at £60 more) but when I went to point out the Navman I wanted, I noticed it's price had gone up by £20!
...... Then again, every cloud has a silver lining......
4. So I took my money and wandered next door into Maplins again. Well lo & behold, at the bottom of their SatNav display, was a new model (Keomo) for £69.98! Ch-ching! 8) so I bought it. However, the spec on the box didn't match the contents. The claimed 1GB SD card was actually only 256MB. The Western European Maps only covered UK & Ire and the mains adapter was missing.
That aside, it's not a bad package for the price as it plays MP3's, photo's and video! I was chuffed with that but not so about the missing components (according to the box) and immediately took it back only to find it was the only one in stock and they had no plans of ordering more - the best they could do was offer me a refund. I actually wanted to keep it so asked if we could "cut a deal", thinking I could get more money off here!
Instead of cash-back, I was given an additional 1GB SD card (RRP £39.99) and USB mains adapter (RRP £19.99) off the shelf. I was told the speed cameras & European maps could be downloaded off the website for free so left it at that.
All in all, it's not quite as intuitive as the Becker, but we get along ok. I downloaded the speed camera's but there is no EU mapping to download for free....... What appears to have happened was I bought an ex-display unit that was originally priced at £229. This lower-price version is the same unit but without the EU maps and power supply..... they obviously haven't realised the box still lists the original contents!
Considering I got four free test-drives of different units, had originally budgeted for £90 and eventually got this one for under £70 (plus an extra SD card and mains adapter) I'm happy enough. 8) It even comes with it's own pouch; and the cradle is a doddle to use/setup/remove. The MP3, photo & video players are the icing on the cake for the price.
Bravo Tesco, Maplins & Halfords for their no-quibble money-back guarantees! That's the way it should be IMO.
There is no road there, but a drop of around 10 - 20 metres, through a fence, over another embankment and into a river. 
Coming home, it tells me to turn there again. We suspect it may be an old cattle route that possibly hasn't been used for about 50 years.
