Very Good but hopefully it'll get better
I've had the Humax setup for a few days now. Quality on BBC HD is stunning (I find myself just staring at it for ages) but the lack of HD content in general is annoying - this is nothing to do with the Humax itself of course.
Setup is very straightforward - plug it in and let it setup itself. There are 2 tuning options, a manual and automatic setting. For most the automatic is best as it only tunes in the available stations (classed as Freesat stations). The manual tuning option brings up far more channels but I'm fairly convinced that the extra channels are unusuable (pay channels mostly which are scrambled).
The one big tip i would give is that if you get one of these and it appears that the front panel is covered in scratches, well its not. There's a very hard to spot protective covering on the front and indeed another behind the front panel. You have to pick carefully at the edges and eventually it'll show itself.
Overall I'm loving the Humax - if you want to be able to watch and record freesat HD there's not much better at this pricepoint. Hopefully we'll see more HD content soon and BBCi player will be possible via the ethernet / network port.