I can atest for what Peter says. I still have the 750 and it still performs wonderfully. I purchased it not long after release and have never had an issue. I only upgraded to the 7900 because of the bargain it was at the holidays and I wanted a 7 channel amplifier. The 750 is still in use in the game room. Just not in my media room.
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Main room
Epson 5025UB
120" Visual Apex fixed screen
Outlaw Model 7900
Outlaw Model 5000 (for the ceiling speakers)
Marantz AV7702 MK2
Oppo BDP-105D
Axiom M80's, GoldenEar Super XXL, GoldenEar Aon 3's (sides and rears), GoldenEar HTR 7000's (in-ceiling for Atmos/DTS:X)
Outlaw LFM1-Plus and EX
Directv HD DVR
2 HD Monster Power centers
PS3
Harmony One