I know almost nothing about this recorder, but I very much doubt that you can skip the adverts whilst recording. I always record programmes with commercial breaks, then play them back with fast forward during the ads.
It would seem impossible to skip the ads when watching live.
No it doesn't skip adverts. You can't receive any encrypted programmes. You will be restricted (at present) to BBC HD and the very limited amount of ITV HD. Most HD programming is encrypted and therefore subscription based. BBC1 etc and ITV1 etc are not currently in HD so it's SD.