Experiences with air-to-water heat pump from Alpha innotec alira lwd series?

Hello, I wanted to know if anyone has experience with the Alpha innotec alira LWD series, more specifically the LWD 71A RX, and can tell me a bit about it like noise level, efficiency, costs, quality...

Would be interesting to me as well

As an alternative, take a look at the power-controlled LWDV. It may bring 2000 euros BAFA funding, if BAFA keeps its guidelines that way from 2020. And supposedly consumes a bit less (10-15%).

I would only have a modulating heat pump installed. As well as have the underfloor heating calculated with defined specifications.