Ive got a 3100, the guy I bought it off said the colour screen ones were prone to crashing.

I paid £80 brand new, and collected it.

Its great! You can call contacts from your phonebook without having to prerecord their names. Just press the green button on the lcd unit and say any name in ur phonebook.

Also mutes the radio when a call comes in.

Very easy to install, however, because I only run 2 amps in my car, I had to get some £1 speakers from the pound shop and mount them accordingly.

Well recommended!