I'm a long-time (very long-time!) Windows/PC user, who for years resisted even looking at Macs, even though I used to sell them once upon a time (in 1984). I reluctantly bought a MBP 13 a few weeks back for my music studio, and I was pleasantly surprised, the thing actually works OK.
But, with my expectations high, imagine my disappointment when the mighty Apple pulls a Microsoft blunder, and my "free upgrade to Mountain Lion" gets totally screwed up. I got a code yesterday - after OS X 10.8 was released - and when I tried to redeem, I also got one of those "already used" messages. Then I called a support dude at Apple last night who promised to send me my new email "within two hours". I'm still waiting. I'm definitely not going to spend $20, I want my friggin' freebie, and an apology from Cupertino.