I found dtm to be very slow at processing orders when I last purchased. They never seem to have anything in stock either!
Most of my stuff I either got from Xploited Cinema (in the good ol' days
) or off eBay.
dtm do have some very nice titles though... It's just a shame about the exchange rate and the lack of speed at which they dispatch them.
I used to use tele-movie-shop.de a lot too, but their shipping costs increased so much, that sometimes the delivery was more than the cost of the DVD!
I don't use them any more.