I did look into these, yes. There are a bunch of guys in the States who have been importing them. They seem much less polished than the unit I went for though functionality wise they are very similar. I wasn't looking for the cheapest solution and it was very important that it looked right so I decided against them.
Mine was only £100 more than that, though.
As for mine - getting on really well. Love it. The novelty of playing around with it has worn off now so it simply gets used.. well, as a normal navigation/audio device for which its absolutely great. Mapping is great, used it for a couple of reasonably long trips now and I'm wondering how I ever put up with a Tomtom stuck to the dash. Really happy. My daily routine is get in car, turn key, seatbelt on, hit 'nav' as I pull away and bingo. Really pleased.