I only received this item this week and, so far, it has been flawless!
It's a good looking unit and not too big. It turns on nice and quickly and the hard drive is ready to go immediately. The picture quality is perfect, as you would expect, and it even records all the sound in Dolby Digital 5+1 - all from the integral microphone.
In the highest True HD resolution it will record nearly 5 hours on the hard drive and the camera function is spot on with a good xenon flash. Crucially, you can watch your footage back and easily edit it or simply turn it back onto camera mode and start recording with no fear of taping over anything. Add to this the clever face recognition software, which works a treat, and you can even select bits of footage by the faces that it has spotted - very clever!
All in all, for £550, it is a steal and worth mentioning that it was only released in February so the technology will be cutting edge for a little while yet.