We've got them in one area and have had nothing but problems. Some of it is poor installation but a good portion is parts availability, accessability to some components and just in general unreilability. You couple this with poor representation and I'll keep my Liebert stuff anyday. DaleP
Used to deal with ATS and Stulz in the old days, now I deal with the new StulzATS. Advantages, lower cost than a Liebert, quicker ship times, and now get this rookies and residential guys, the ONLY OEM part is the control board. If you need a mechanical part you can just go buy one from a commercial supply house. Yes even those funny looking breakers and contactors are actually off the shelf items if you go to the correct supply house, not your local Graingers or Johnstone. Factory will even tell you the parts are all off the shelf. We install lots of them, just like anyone's equipment, follow the instructions and they'll work well, wing it and you'll pay.
Don't let your ego get in the way of a good decision