Hi,
I use a Navman icn510 which was the older model and I am quite chuffed with it.
The only slight niggle is the upgrading of the mapping,a bit costly and you are never up to date mapwise.
But I do like the screen variations that you can use with it.
All in all at the price you are being offered one at I would give it a go,just about 15 months ago I paid £400+.
Happy sat navving,Paul.