Well Brunswick now makes models called GSX. That is the only model that is *new*. They are more electrical than the A and A-2. With the exception of the triggering that starts the cycle, The A and A-2 are completely mechanical in operation, only one motor drives the whole machine. The center here used to have Brunswick A's and they were VERY reliable, for the 16 years i bowled with them i only had 5 problems with them. AT the end of last summer the worst happened, the A's were taken out and replaced with machines made by AMF and they are horrible, i cant count how many problems i have had with them already. I have bowled with GS's before and i have found them to be not as reliable as the A models.