This area has traditionally always been the last to get broadcasting goodies, and Freeview HD won't arrive here until March 2012, so two days ago I bought myself a Humax Foxsat HD set top satellite box to experience Freesat HD in all its glory. There is an option to correct synch problems in the setup menu, but I haven't needed to use it.
From my experience so far, I'd have to say HD is a bit of a disappointment really. There's currently only four HD channels - and they don't always transmit in HD. I suppose I could improve the situation by giving 30 quid a month to that loathsome pariah Murdoch, but hey...