I can't link to it as it's against House Rules, but most people are having serious issues with stability of the box - one person mentioned it had crashed on them 6 times in one evening. There's also lots of talk about the lack of shielding on the tuners and how this can cause interference with other equipment. I can't say for certain any truth on this, just what I've read. However, a lot of new purchasers have said they are going to or have already returned the box to 3view for a refund.
Personally, I'd go for either the Humax or the Digital Stream DHR-8205U (the one I have, you can read my thoughts on it
here). It's generally agreed on other forums that these are by far and away the best (and definitely most stable) of the current Freeview HD PVRs. Which one you go for will depend entirely on your own preferences - if you can I'd try and see if you can get to a John Lewis store with both of them in so you can try them both out and see which one you prefer.