Just curious, why would you love transparency? IMO it’s distracting at best and crashy at worst.

Karabiner is amazing. I love that I can finally recommend it to people and they don't say "I have an iMac…"

@leephillips - good news is that linux installs fairly painlessly on the iMac 5K. I'm running Fedora 20 and it's going really well. Some slight funkiness with sound but I'm sorting that out now. Need hardware accel for gnome shell so required this workaround for the ATI drivers: https://bugzilla.redhat.com/show_bug.cgi?id=1054435

Unusable in terms of performance?

That's a very small part of it. I just hate the new look in some places, like the color-changing Safari toolbar, and it's just useless and annoying to me. Maybe 'completely unusable' was a bit of an exaggeration…YMMV.

Glad I'm not the only one. It's not nearly as bad as my 2007 on 10.6.8 though.

Same here, on a 2012 Air. Performance is great but I've noticed a couple Safari crashes/freezes. Finder crashed once I think. Also had trouble with Dark Mode+Reduce Transparency, but those are just beta issues and since GM1 the only issue has been the weird black corners of the volume popup.

I wish they would support even older hardware, my 2008 mac mini is just crying for an update.

10 year backward compatibility crippled MS. I'm not sure where the line is, but 6 years seems pretty old too.