1) Stable Scan Stage. I hate trying to anchor down a moving model and since this thing only spins it's easy. Full size articulator scan big + too. 2) My re-seller critiqued the scan quality of various units and the DOF hd was on par with the Medit and better than some others. 3) I like being able to manually mesh a separate scan into the final- maybe all Exo systems can, I don't know. 4) The package included a few extras- for all I know they are standard now: multi die, all-in-one quad (fast), implant module. Price was competitive. 5) I like companies that are hungry for market share. In my experience to date, they work very hard to keep customers satisfied and are quick to respond to any issues. 6) The internal modular design makes repairs and replacement easy if it's needed. Yes, it should work all the time, but everything breaks or burns out sooner or later. It takes less time to fix a modular system than to crate the thing up for a loaner, IMHO. Enough? 18 months later it's all good. Wish Exo would listen to a few issues though. Too many clicks in basic mode- that's what the Expert mode should be for, no? I thought you had a DOF also. Your reasons?