I bought a new MBP in June, but opted for the high-res, non-glare display instead of the Retina, for a number of reasons.
1. Didn't want to pay over $4K to get the largest amount of storage and RAM
2. Didn't like the fact that I couldn't upgrade either of the above, ever.
3. Don't like glossy displays - though the Retina isn't quite as bad as the glossy regular MBPs
4. Still wanted ethernet and the optical drive, though have to admit, I have yet to actually use said optical drive...

I love Mountain Lion - haven't had any issues with it, other than the widely reported issue with Transmit. (If you leave Transmit running and your machine goes to sleep, it freezes the wifi - only resolved if you restart. Very annoying) I've still not upgraded my Mac Pro, but that's simply been due to lack of time due to ongoing elderly parent issues etc. I have to move one last client website from GoLive to Dreamweaver before I do that, as GoLive won't work in ML.
Lion Tweaks and Mountain Tweaks take care of all the odd things that have been introduced with the last two OS', like the Library visibility etc.
