The ease of use is outstanding. The themes supplied (and/or linked to in README) are great. Except that it's very broken right now. For example, every Carbon app I've tried crashes on a "Save As..:. This includes must-use apps like Flash, BBEdit, Mozilla, etc. I didn't test others but only found Cocoa apps to not crash (e.g. TextEdit, Safari). All apps I tried launch, work, and look great. It's just anything that brings up the system save dialog is a crasher.

Until this is fixed, which I hope is soon, it's unusable.

Also I was a bit diappointed that the Finder windows in Panther do not skin full when in "Toolbar/Sidebar" mode. In particular, the title bar is not skinned except for the close/min/max buttons. Putting the Finder windows back into "Jaquar" mode fixes this, but at a loss of the new functionality (of course).