Batteries are fairly cheap and easily available from Ebay or various other sources.
Screen is small, but perfectly adequate IMO.....just mount it fairly high up and you get used to it very quickly. (plus you can use the audio output so you're not looking at the screen)
The other thing that goes wrong after a long time is the ribbon cable that connects the flippy up aerial with the PCB.......that can be replaced, but I just used a
£10 aerial with the correct fitting which I mounted on the beak (and another on the top of the Landy)
Superb little units, very useful to be able to take it off and slip it in any pocket, plus being able to take it into the pub at night and poke around at the next day's routes is great.
The memory issue is a minor pain...(243 MB on the EUROPEAN version...the Merkin one had only 115 MB, so check which it is!!), but I used to have a route all around the UK picking up bikes, down to Plymouth/portsmouth, across Spain AND the Moroccan topo maps loaded with no problem......as mentioned above, you just do the route in mapsource and load it up with the tiles you need selected rather than everything.
Official mapping available is now well out of date, but there are lots of alternatives out there.
I reckon the Quest was the best bike GPS ever and it's a shame they stopped developing it ....I'd certainly have another one
Have seen them on Ebay for around the £60 mark with cradle, mains charger and mapping, or around £80 for the same with a ram cradle and mount.
Old review
HERE