in my experience most elevator company equipment is ok. all have good and bad designs but generally are fine particularly the gearless dc high speed lifts which are pretty good regardless of make. the non proprietary statement basically means that the diagnostic componant of the lift is able to be activated/accessed without the company providing an access tool or code limiting this to company employees and reps. the proprietary companies limit your access to these things. so if you decide to get another company to do the service then the new companies ability to provide good service is limited and harder.
