Bought this for same price at christmas. So far been great, no problems with coil whine or anything. Completely silent as the fan hardly ever turns on, don't think my system draws enough to actually turn it on. Only got it as wanted to quiten down my PC as my old PSU had a really noisy fan, and for that has worked really well.
The Corsair RM750x (2018) = Tier A PSU. The new 2021 version is available: Corsair RM750x 80 PLUS Gold (2021) Review of the latest version: https://www.tomshardware.com/uk/reviews/corsair-rm750x-2021-power-supply-review