That is poor about the delay of FXHD if thats the case.
Now is it worth it? You have spent £300 or there abouts on a HD box, you have spent a small fortune on a HDTV. £10 extra is a small price to pay, its a taxi home from town on a night out, its a take away meal, its a round of beers, its two packets of fags (I think, I dont smoke!), thats how I look at it. If you have a night in once a month instead of going out, then have HD TV as a treat instead.
You have made all the bigger outlay for Sky, so an extra £10 is worth it in my view. You have movies and sports so why not watch it all in HD. Maybe lose the Multi Room subs if its a problem financially, and then swap back in the future if its not worth it.
I dropped Multiroom as I didnt use it during the non football season to save myself a few quid.
Do you have Broadband, maybe drop whatever you are paying on that and get Sky Free BB.