Ummm... I'm sure some people had problems with their Neptunes... but... mindful of some risk, when I bought my Neptune 7500 set in 2001, I got a seven year extended service agreement on both units.
Fortunately at year three, when in short order the motor, motor controller, main board, and belt/tub driving spider all had to be replaced, it was all covered by the extended service agreement. I later learned that my washer was a relatively early model in the third generation series. I understand that later models has new motors etc which would have avoided some of the problems. The cracked belt/drum spider, however, was just a disaster waiting to happen.
Since then haven't had any problems to speak of with the set. No mold or odor in the washer, either.
So... the Neptune problems were all fixable... but an extended warranty was a very good idea to get with these machines.
So I have mixed feelings about the Neptune. I don't actually think it's a bad machine, but it was hampered by poor manufacturing practices. The solid door is a point of contention amongst laundry enthusiasts, but I've learned to deal with it. I can actually tell from the sound if too much suds have developed.
There's also a lot good about the 7500 series. You can more or less instantly pause and open the door at any point in the cycle (well, a spin might make you wait until it stopped). The LCD display is really a great feature. Not only for setting up a large number of custom cycles, but also for the diagnostic tools it offers.