I gave notice to Sky for TV (I'm sticking with them for phone and broadband) and decided to go for a graded HBR-1010S 1TB box direct from Freesat. It was a bit of a toss up between YouView and Freesat, but I figured it was a close call now and the satellite platform has massively more capability to deliver more HD channels in the future, as it does already. YouView is always going to hit constraints of limited spectrum so it has finite potential.
I would agree that PQ seems better from the Humax than the Sky box, especially on SD channels, which are actually quite decent on my 40" 1080p TV.
However, compared to Sky software the Humax interface is pretty clunky and the inability to record catch up shows is a disappointment. I really don't understand why recording of catch up is not supported or why we can't have more HD channels included (e.g. Film4, Channel 5 etc..). Also box startup is slow and the Freesat app falls well short of Sky's version. Still, for the monthly savings I can live with the shortcomings. On the plus side the Freesat box has plenth of features not offered by the Sky box, so there are some swings and roundabouts.
Anyway, I've still got a week to go with Sky, but I've already decommissioned the Sky box as I don't have four satellite feeds to satisfy two boxes at once and I might as well crack on building my recorded library on the Humax to suit my needs and not simply the contract termination date.
I will be using NowTV to reinstate some of my missing channels temporarily (I have a three month voucher courtesy of Chromecast and doubt I'll pay once that runs out after xmas), but that will be run from my Xbox, so all in all there is increased fragmentation by going down this path, but once again that's the sacrifice for saving money.