Sure did!
I did this back when HBO cancelled Deadwood. Have NOT missed it at all. First off I rarely use the streaming, I usually get the disks, and so have perfect sound and picture. If we watch a show I mail it on Day1, Day2 they get it, and by day3 I have the next one. EVERYTHING you miss on HBO is eventually on disk, so I haven't missed anything. As far as the 30 day wait on new stuff, I've always got 80-90 items in my queue at any given time, so I really don't care if I don't get it the day it comes out. I've got WAY more than I can watch as it is.
I'm with whoever said the HBO's etc, should be about $6. Anything more than that, and I'm sticking with Netflix. Had them since 2002 and have NEVER had anything bad to say about them. (The price dropped, and they added features over the years).