Keh has been great for me. However, just keep in mind 3 things:
1. They do not necessarily test equipment or run film through the cameras
2. You have 14 days to return, but FROM DATE OF PURCHASE! That might mean only 1 week or less for most people because they can be very slow to ship. Test immediately.
3. You MAY get a better deal by NOT buying an outfit. I discovered I could have assembled a Hasselblad kit myself from their separate listings and had a better screen for the same $ as the outfit--and saved the $215 I now have to spend to get a decent Accu Matte screen (they were unwilling to just swap the screen).