Who has a Supco Hard Start on their A/C unit?

I went to a seminar in 05, put on by the coinventor of the "5-2-1" kit and the guy was then working for Harris welding products which were also covered that day. It was the best seminar I've ever attended! I only remember his first name was John. They named their hard start kit after the 3 potential relay terminal numbers that connect to the compressor terminals. It's so easy to remember how to install their kit. 5-2-1 = common, start and run. That one and the comparable kit made by Hardstart are very good kits and use a potential relay. I've put the 5-2-1 kit on EVERY AC I've installed since that seminar, including my own. They add life to a compressor. John and his partner researched 230v residential single phase compressors and came up with a good cap size and relay pickup/dropout voltages for each tonnage. Johns speech got pretty technical but the keys point were... a potential relay isn't limited by cap size or current draw like a PTC relay. A compressor w/o a hard start kit builds up more internal heat because of the long start process than a compressor with a proper start kit. It's better (less heat and stress) to give the compressor a HARD kick and get the rotor up to speed than to let them start w/o the extra assist. A PTC is also no good for rapid cycling machines cuz they require a cooldown between cycles. A potential doesn't care.
After 10 year in a service truck, I took a plant maint. job in 85. That plant had some single phase RTUs with long wire runs and the compressors sucked the voltage down so low on startup, they would cycle on the OLs til they finally started. Someone before me replaced the compressor after they burnt up and put buck n boosts on the two worst units and they weren't working much better. I pitched the buck n boosts and got the right hard start parts from the comp. mfgr. and they never gave me another problem. Craig