Edit: The update went smoothly and it's looking much better that P4.40. I haven't moved my NVMe SSD back to the motherboard M.2 socket yet because due to its location on the underside of the board I've got to strip everything out of the case to do it, so it's not going to be a ten minute job. Assuming it works (and based on other people's experience I have little doubt that it will) most of my objections to P4.40 will have been addressed.

I think there's a problem with the PWM fan control in L.4.43 though. I have a big (140mm) slow (~800 RPM) PWM-controlled fan in the front of my ITX case and although I've used the Fan Tuning Tool to discover the minimum duty cycle and calibrate the speed curve if I choose any profile that's less aggressive than Performance I get either a displayed fan speed of "N/A" or one that fluctuates wildly between 800 or so and 18000 (yes, eighteen thousand!) RPM, which is clearly impossible.