As I'm looking at expanding my recording into a 2nd room, been looking at various boxes lately, and thought I'd add my thoughts.
The Samsung is a good all round device, but not the greatest freeview+ HD box. iPlayer and Lovefilm are good, and so are the streaming capabilities. Assuming this functionality is similar to my Samsung BD-C6900, as in very good except that it can't interpret ananmorphic video correctly, (ripped VOBs are squashed and Samsung aren't interested in fixing the issue); this also affects their TVs I believe, so probably also this box.
For me that fact it can't record two channels, and can't record while showing iPlayer etc, just makes it problematic at around £200.
The Humax HDR T2 models, (1Tb or 500Gb), can show iPlayer, (no Lovefilm yet), can stream DLNA content, (no direct experience but supported formats seem good; fly in the ointment is that it stops after 4Gb of streaming but hopefully this will be fixed shortly with firmware). You need a wireless dongle for wireless though. It can also play just about anything put on it's hard drive, (with no 4Gb issues).
The Humax can also act as a server, serving up recorded content or that on its disk to other DLNA clients. It also allows FTPing of files to and from the Humax. Files will play or stream to another Humax, and can also be decrypted using simple utility so that they can be played on other players.
Obviously, it can record 2 or more channels at once, (if some channels on the same MUX), and perform its other functions at the same time.
It's a bit expensive, but is really good.
Digital Stream also looks good, but the file format of output files seems difficult to play on any other device without a lot of messing, and the DLNA and iPlayer still haven't arriced the last time I looked. I was seeing it at around £200 for the 500Gb, and against the Humax 500Gb at £250 it didn't seem to do enough.
Another device worth considering is the HD Fox T2. This has just one tuner and can record to an external USB disk. Can record more than one channel only if on same MUX. It can stream files from a DLNA server, (same 4Gb limit currently), and has FTP. It also has iPlayer. Again needs wireless dongle. Costs about £90 or £65 graded (grade A) from Humax. To me this is better than the Samsung as it's about half the price, if you can do without LoveFilm, and you can use iPlayer while recording.
There are other boxes like TVonics that are good but when you look at some features they lack, even when there's a price difference, to me at least, they don't compete.
To me Humax really is the way to go, just for the features, and the firmware and other software updates and utilities that get created. It seems to have a thricing commnunity. It pretty much covers all bases, is easy to use, by all accounts, and one of their recorders can be a hub serving other DLNA clients.
Hope this is of use to people considering various PVRs.