Product review (5 stars): Impressed
I got this item for three reason, one was for the dimming light issue in the house when the HVAC came one,  to hopefully add some life to my old compressor, and cheap enough for me to have first hand experience with what some HVAC pros were recommending. Thus far,  I have been impressed with how the HVAC has been running for season, and we have had some hot days ( high 90s F some days). The compressor unit starts easier and I am impressed.  Now that I see the value I may get a higher quality unit next year. It looks like it makes sense similarly to installing a UPS on a computer; an extra expenses that just makes sense for longevity.