I'd argue that OS X (to use the nomenclature of the time) 10.0 was alpha quality software, and even 10.1 was at best what we now would consider beta software. OS X was not usable until 10.2 (and that's when many major software such as Photoshop and even Apple's own Final Cut Pro received their first native OS X port), but even 10.2 didn't reach feature partiy with classic MacOS. It wasn't until 10.3 Tiger that you could safely recommend to friends and family to upgrade to OS X.