I took the plunge last week, upgraded all my eligible PCs to W11
On my low-power NUC-style PC which I use for day-to-day general stuff, the general performance massively improved. This little 1.1GHz QC Celeron LOVES Windows 11..
On my 12-core Ryzen studio PC, the performance didn't change that much if at all, but it's certainly not worse
Zero issues with faulty apps, crashes, drivers, anything
I miss having old-style non-grouped app tabs on the task bar, but that's the only thing