I have a 4 year old Nordic Trak that I bought at Sears. Haven't had any problems with it, I've been real happy with it.
On the other hand, my mom bought one direct from Nordic Trak last summer, and she had to wait for parts to arrive a couple times, and then finally a service tech before she could finally use it. First there was a part that arrived broke, then the motor was bad, then the incline wouldn't work.