When I went on to V+ I was given a Scientific Atlanta box and the consensus is that it's pretty good. The only problem is with these boxes is that they're a wee bit too sensitive when it comes to fluctuations in signal level, I.e. they have the tendency to look at the incoming signal and if there's any deviations over a short period of time then the box assumes there's a problem and promptly re-boots.
The likelihood of this increases when you're recording and watching a programme in HD at the same time - irritating to say the least especially when your recording is cut into two portions with the loss in between.
Changing the box would probably fix this issue, however the Samsung boxes don't have an RF output - something that I use (on the SA box) to divert the signal so I can watch TV in my bedroom, in addition, I've a load of stuff recorded that I don't want to lose. One of these "learn to live with it" scenarios.
Sigh................!
Si thee