This is something I was determined to do methodically too, it was going to be an appendix of a ‘how to get the best of PUM’ thread so that they didn’t just have this generally bad press … I agree there are certainly glitches and they are not just about usage constraints
Perhaps collate these observations here too (for example, there may be other threads) so the general community can see and discuss what we have all found and reported and perhaps discuss workarounds or steps to avoid