I flogged one or two Garmin i3's on ebay.. they are excellent value for money, and are worth considering, especially since they can be picked up for £99, as mentioned..
However, the TOMTOM ONE for example, is a much better product, that's not to say the i3 is rubbish, but it does have one or two small limitations.
1. The GPS Chipset is distinctly average, it can struggle at times to get a lock, and in built up town centres with tall buildings, it can lose the signal a little too easily, you can get an external aerial for it, which would help if this becomes an issue
2. There is no way to just view the map, select a 'spot' that you want to goto and then navigate to it, you can only navigate to postcodes or addresses it has in it's database, This is generally not too much of a problem until you want to go anywhere (usually rural or a business) that the postcode isn't correct/available, and you don't know the 'street number' for it..
3. The screen is very small, but I suppose what do you expect for the money
4. The screen update rate is a little slow, and this can make navigating a set of roundabouts a bit annoying, as it's always catching up with you.
The TOMTOM ONE has the latest GPS Chipset, larger touch screen, with more ways of specifying a destination, it's extremely fast as well..
I originally had an i3, but have upgraded to a TOMTOM ONE, despite having numerous PDA's and smartphones with TOMTOM on them, I just prefer the dedicated units, they can't be buggered up easily, and just work so well..
