I was a member of dvRABontap for about 4 months.
Not bad to start off with but they didn't buy all the new releases so the selection was limited and they didn't have a huge library of older titles.
Cancelled after a while, coz I got bored of what they had and ran out of things that I fancied watching ( plus the wait for titles was pretty long ).
I'm now with webflix.
They're SO great. Highly recommend them.
I watch about 2 -3 DVD's a week from them .. have up to 2 at a time .. and usually have a fresh one in my postbox within 3 days of sending back the last one.
They have a huge selection, loaRAB of copies of most things ( some more arty titles movies you may have to wait longer for ), but they do buy in most ( if not all ) major releases ( arty and blockbuster ).
Also, if the disc gets lost in the post .. they don't bitch about it and just send you the next one on your list, and even APOLOGISE !
Great website too. Very easy to use.