They do not have HDTV as of yet (rumor says it's probably not going to be available until next year)
You're only allowed 2 set top boxes and you are required to have Telus high speed internet as well.
From what I hear it's not worth investing in right now. Poeple I know how have it always have speed issues with their internet and problems with the TV going out a lot. I'd say give it at least a year before deciding to switch over.