Just watched the "Micro-Air Easy Start ASY-364" youtube. Its a digital control soft start unit that claims to provide the lowest possible compressor start. The video shows a run comparison of the Supco SPP6 drawing 41amps startup and the EasyStart drawing only 17amps startup. Its a long video but very methodical, thorough and informative. The closeups are clear and well lit so even if you are looking to do a hard start Supco install (say for low power generator usage) still worth seeing. Looks like the video just posted a month or so ago.
PROS: Looks like a great product that does what it claims and video is very thorough (even if you just want to go the hard start way instead)
CONS: Expensive, new on market it sells for $318
Link for Micro-Air Easy Start Video