Isn't that the sad truth. OS X used to be so nice - I have machines here running 10.4, .5, and .6 (a PPC G4, G5, and a MBP 1,1 and a 2008 MB (don't remember the exact model but it could run Lion if I wanted). From 10.0 - 10.5 things really improved each version (save dropping classic in 10.5). When 10.6 came it was a little heavier, but still very nice to work with. Then Lion hit, and it was downhill from there.There are a few features in the newer versions that I like, but they could be back-ported to older versions if Apple allowed it (iMessage and FaceTime being synced with iOS devices, and iCloud), but that sadly isn't the Apple way. I've had to manually compile patches for PPC machines to keep certain core programs (like bash) updated against some major vulnerabilities, but otherwise some of these systems (like my Quad G5 running 10.5 after installing some rather fast HDDs and 16GB of RAM - if I could get a better GPU in their I'd move it to SSD as well and watch it fly) are still very usable.