we found blockbusters much cheaper as there isnt any limit on number of DVDs hired in a month. Brilliant service, quick turn around and saved a fortune in late return fines from local video hire shop.
Saying that, just cancelled as we have now got multiroom and sky plus which is soooo brilliant. Able to record so much that we dont get round to watching our DVDs. Might pick up the DVD rental again when the weather is cooler and staying inside more as it is good value for money.
I use LoveFilm.com and think they're brilliant (although we did have a blip in transfering my switch card across when the old one ran out - but I think that was a software bug that has since been fixed). Unlimited number of DVDs a month. 1 disk at a time is £9.99 or 2 at a time for £12.99 so a bit more pricey - but then you don't have a monthly limit (and even on my 1 disk at a time subscription I easily get through 2 in a week - so 4 a month limit would REALLY bug me).
Ooo also, lovefilm pretty much have every disk that's released in the UK including all the old stuff (I got recommended it by a friend who was really into Bollywood which none of the mainstream ones had at the time). Posting out is very quick, as I say, I easily get through 2 a week on my 1 disk at a time subscription.
We've currently been going through series - Alias at the moment (because we were never organised enough to remember to watch it on tv). We went through a "let's watch all the old Clint Eastwood movies" phase. Yet they still seem to have a decent quantity of the new releases to send out.
We use amazon. I can see if you watch loads and loads then one of the unlimited ones would be better but I'm pretty happy with 6 for 9.99. Tend to get one for the kids for a fortnight and then one a week for me and DH. Do that twice in a month and we don't get chance to watch anything more. Find them really quick. Had one film that was scatched and the replacement came the following day. Also had one blip when Harry Potter turned out to be Closer!!!!! Good thing I spotted that one but at least we got a free film from it. I think these subscriptions are much better than paying nightly, especially for kids films when they want to watch them for about a month!