We have put in quite a few. They seem to add about 20 new parameters every time I adjust one. I think they are on par with the MCE 4000 series stuff. They are easy to work on and have good prints. The tech support sucks although it was great when they first came out. The tape reader is a mechanical POS. The starters they use suck and are undersized. We typically use these on duplex apartment units 350 ft/min or less. I have done a larger group with these and had no problems. I have not done any gearless on this system but really it wouldn't be a problem since they use drives that are industry standard. So I guess it comes down to pricing.