I don't think you'll regret it. I think the issue with calibrating the park stands is that they do go out of calibration fairly quickly in a bike shop environment. So the calibrator tool is good to have around. I only use one caliper and flip the wheel, so the calibrator isn't as much use to me. I recently learned that the tightness of the pivot bolts is pretty important to the accuracy of these stands. If they are too loose, it allows the arms to shift from side to side.

My LBS has a TS4, it sits on a shelf in the wall in case a mechanic needs it. I made a set of adapters for a TS-2.2 that allows a wheel up to a 5" tire on a wheel to be trued. Haven't gone into production yet, it's on my list.