never had a problem with my duo, but the other alternative is a laseractive. expensive, but pretty damn tank like.
Laseractive being tank like lol, yea right.....if so, maybe like a shitpiece T-72.
I own three Laseractives, and only one works. I own two Turbo Duos, and both of them work well.
Trust me, the Laseractive is the worst of the bunch. The disc tray is a pile of garbage that always sticks. Not to mention, the NEC pak seems to be selling near $1,000 now-a-days, which is the price of 5 Turbo Duos.
Too bad, because the Laseractive is an awesome system, but that is getting off topic.
Plus every Sega PAC ever made appears to have defective capacitors. Replacing all 80-something of them is lots of fun.