I'm finally going to upgrade my 2006 Mac Pro this summer when Mountain Lion comes out, but I'd like to first hear a bit about what new Macs are like, from people who regularly use them and know the difference between "flawless performance" and "a little buggy." My Mac Pro runs flawlessly on Tiger, very well on Leopard, good on Snow Leopard, and alright on Lion. I can accept this as a consequence of them not tailoring the newer operating systems to my machine, but rather to the latest machines coming out. But nevertheless, overall my machine has remained incredibly steadfast, trustworthy and functional for six years now, and shows no signs of slowing down. 1. Are new Macs as sturdy and expertly crafted, hardware wise, as the 2006 Mac Pro was? 2. Do they run Lion smoothly with no glitches? Thanks!