I've been using this for a whole now and really happy. Looking over the repo it seems there has been some software improvements so I will upgrade mine now - saving the settings will be very useful as it's too dark for me by default. Thank you!
Regarding the lens, I'm using the '6mm 3MP Wide Angle Lens for Raspberry Pi HQ Camera' and I have zero problems with it. I'm hardly moving in the way I use it as a simple webcam so I have no problem with staying in focus and I just don't get what a few people are saying about distortion, I must be blind. I looked up one of the recommended alternatives, the 'Fujinon HF9HA-1B 9mm 1.4', I can only find it pre-owned on ebay shipped from China for £70 (+ a load of tax I am sure). I will happily stick with my regular lens.