Not the new ones (i.e. Fiire 12TB, Invisible and Prestige now advertised on their website), but the previous range (Engine and Stations). Their specs claim the Stations do 720p and 1080i/p though, so this kit should be OK for HDTV. I have them attached to two HD-Ready 720p screens (one plasma, one LCD), which seems to be a major part of the problem.
No, they did not work out of the box. We (Fiire and me) have had a patchy time trying to get them working, thanks to BT's lines going down and taking my internet connection with it for several weeks. And, to be fair, they have tried, although it seems to need _a_lot_ of input from me. I am giving them one last chance to get things working, so I don't want to say definitely that they have failed yet, but it's looking pretty likely. I'll tell more if that proves to be the case. Frankly, if there is no happy ending, this is a pretty miserable story that ought to deter anyone from buying their kit.
If you are looking at whole house systems (which I am also looking for - this was a trial), I am thinking that my next stop will be Convergent Home Technologies' Dianemo system. It may also have problems, but (a) they are in my home country, and (b) they are supplying systems, not just boxes, so it would be their job to make it work.
Alternatively, I may just give up and get some WinMCE boxes. I hate Windows, but at least WinMCE works out of the box and doesn't have problems with DRM. There is a limit to the amount of pain it is worth taking to use linux instead of Windows, and I say that as someone who has been using linux for over a decade, and even have it on my work laptop. I am pretty committed to linux, and to Free Software and Media standards generally, but I've been trying to put this sort of thing together for almost as long as I've been using linux, and progress is so slow and patchy that you can barely see it happening. Any changes just seem to introduce new complications, not solve old problems.