I've read most of the comments up until page 10 so I'd like to bring up a couple of issues. I'm not a current Mac owner/user.
A lot of people bring up the notion that for them, Apple is about the Hardware AND Software "Experience". Now I'd agree, there is something to the Software "Experience", but Hardware?? I'd say its the software. The HW has been for sometime now 'better' grade PC components made for Apple by other manufacturers. I've used XP (about same time OS X was released) all the way to Win 7, many Linux distros, FreeBSD, BeOS, Solaris, etc and still nothing beats or compares to OS X.
Now before going on, please note I feel OS X kicks some serious ass. I've never been happier and more productive than using OSX. Its the OS and the great (compared to PC) 3rd party apps. Heck, some OSS software had been better engineered than Windows versions (I've been a heavy user of TeX). The TeXLive distro is fantastically well integrated and one of the reasons I love using OS X.
I owned a 2nd Gen iMac G5. I was happy with the hardware in that it looked nice and worked. But, I found that as a more technical user, the expansionless internals of the system left much to be desired. I would have loved to at least add one extra HDD in the case. Couldn't and still can't. I found the FW and USB ports to be particularly finnicky - much more than any PC system. The nice, clean design for me was a misnomer as I had an external 2 HDD Raid enclosure and one external DVD drive. The built-in CD/DVD unit in the iMac was frankly retarded. It would jam up at least once or twice a week on fairly good quality standard burnt discs. Nothing my PC wouldn't handle. I'd need to reboot the system just to make use of the CD drive. Which is why I got the external. There goes the asthetics argument to me.
There's also been problems with Apple HW. Fans on 1st gen iMacs didn't work correctly. Defective nVidia chips (that was nV's fault) , etc.
The problem I have with the Apple HW experience is its also a PITA to get it fixed. If you don't live in a City with Apple shop or don't have a car to access one either you take time out of your day and arrange for Courrier pick-up and delivery to Apple or take a Cab/bus with a system. You're left w/o a working system. With a PC if the part is reasonably cheap to replace, and most you can get running for > $100, you can just replace yourself and warranty it later.
So maybe the system I had, had some problem parts (expansion slots) and CD/DVD drive. I felt Apple HW warranty claims to be such a PITA, I'd put up with it. Had it been a PC, a new $20 CD/DVD drive would have fixed it. In fact I have a $20 DVD burner I bought 3 years ago and not one single Jam. Maybe its because iMac has the side-loading, slot drives. I dunno, but doesn't reek of a qualtity premium-grade/price HW to me.
I love the software. What people with a PC do with OS X is their own responsibility. All I know is if I built my own Hackintosh, I'd have much better hardware in it than what I can get in an iMac (I can't afford the G5) for much cheaper. I'd have an expandable system that I would be more pleased with aesthetically (can pick the case etc). Dell and HP systems have cheap hardware. But if you 'build your own' and choose more premium parts PSU, Motherboard, Video Card, there IS ABSOLUTELY NO REASON why these parts won't last as long or longer than the Apple parts. Apple doesn't manufacture its own stuff - it outsources it to other manufacturers to build under Apple spec.
I think Apple's choice to move to Intel was great. They didn't have much choice. But it opened Pandora's box.
The only people they might be losing to (or are more likely to) lose sales from are ethuiasts with the technical know-how, ability and desire to setup a hackintosh. Charge more money for the OS and don't provide support. If they charge $400 or $500 for OSX (which would be RETAIL for Windows 7 ultimate but infiinitely better) they'll make the same margins as they would with a mini or iMac. And the people doing this won't call Apple support. They use the Internet. When I owned an iMac and had one-year Apple care, I never called for support *** and I've never called any HW or SW manufacturers for support either.
I've also toyed with the latest iMac systems in the Apple stores for 1/2 hour. The HW itself, I'm indifferent to. I've tried some i5 and i7 systems and they don't 'feel' any better or worse. Software gets the job done.