I use them. I think they are great. You don't have to trim the loops or anything to make them sound great. There are even double bass drums on some of his cd's. There is even enough sampled drums to put together your own kit. You will not regret buying anything from him.
I've bought 3-4 CD's from Chris @ Betamonkey. They're definitely good bang-for-the buck if you're into the Pop/Rock genre.
The only problem I've encountered is that some of the loops do not loop smoothly in Sonar (which is what I use), due to clicking noises where they're looped together.
Can't fault Chris on his customer service though, e-mails are answered promptly and courteously, and product is shipped very quickly.
i had some questions about them so i emailed him and like you said he promply returned a response, i ordered the alternative/modern rock volume 1 and 2 set, i understand he will also custom make you some too, i got some of his demo ones and there real good ive had some drum loops pop and crack too