Page 1 of DVDs on tap

Has anyone tried this company?
Are they any good and how long can it take before you get your films in the post

http://www.dvdsontap.com

I`ve signed up. I`ve only had half a dozen discs so far but they`ve all arrived as fast as they could given that they are posted. Eg. I can post one back on Monday and be watching the next one on Wednesday.
The web site is also way easier to use than the other uk ones, in fact DVDSONTAP look a lot more professional all round. (No connection, just impressed).