Today was OCLP day again.
Early 2011 MBP 8,2 from Monterey to Ventura. Rather laggy and jerky, but may be due to being throttled back because there's no battery. New one incoming, so will see what happens.
Late-2009 iMac 10,1 27" Core2 Duo from High Sierra to Monterey. I seem to remember the first time I tried this, it was not too wonderful, so I just got the apps I wanted and returned it to HS.This time, with 16GB RAM installed, it seems nice and smooth, but I've only had it up and running a short while, so we shall see...
Mid-2011 iMac 12,1 21.5" i5 from Monterey to Ventura. Entirely straightforward, with no gotchas along the way. Might try this with Sonoma, no obvious reason why it won't work.
Did also have a go at getting the MBP to recognise more RAM, but it obstinately refuses. Apart from crap soldering, what else can realistically cause so many of these to have bad RAM slots?