This service is really good. The guys were surprisingly fun to talk and listen to while we did the Challenge Modes, they also made the CMs seem so easy.
Me and my friend got a time and date last week for when we should run, but we actually f*** up with us failing terribly at paypal, and my friend had not done any dungeons on heroic. These guys were actually cool with it, even though they lost about 180 euros because of us messing up something so easy.
I really recommend these guys. You get to play your own character, this is the cheapest CM service out there (that I know of), and it took us about 2 hours even though we had a 10 minute break.