When I was in college the school purchased a single G1000 model...total waste of money but that's another subject...the MFD had issues after a few weeks, our mechanics, then Cessna tried troubleshooting it, swapping screens, etc. with no luck. Cessna ended up replacing a lot of the avionics under warranty and finally fixed the problem for good (as far as I know, the thing is probably still sitting anyway), but from talking to a couple of the school's mechanics if it had been out of warranty the bill would have been nearly 20k if a screen crapped out. True? No idea, but I'm perfectly happy with the $660 it cost me to overhaul the gyros in my Saratoga.