I'm intrigued about the idea of a heat pump. Can we learn more?

I installed a Laars LX gas model about 6 years ago, which rotted from within 4 years. I'm now shopping for a new one, but there isn't really a reliable source of reviews these days (that I can find)

I have a 20x40 inground with about 33,000 gallons. The dead unit was a 400,000btu rating, and although it was great in the beginning, I certainly am not willing to invest in another Laars unless they have dramatically improved their internal materials.