I gratefully switched to Apple with the advent of the IIe as well, and have never seen a need to switch. Still don't.
I have found one thing that bugs heck out of me about the 13" MacBook Air I bought in April. It might help explain the USB3 instability issues I'm hearing about. BOTH USB fittings on the machine are loose. It takes very little to partially dislodge a cord. I've tried replacements cords, both aftermarket and Apple, and they're all lose. Clearly it's the fittings on the Air rather than bad cords. There's no way I can use my Air for tethered shooting, short of a big old wad of duct tape to stabilize the cords.
Worse yet, every time a cord jiggles a little, Apple's accursed Photos program relaunches. If I buy another Apple, it will include a single-click option in System Preferences to shut of Photos. For me it's a downright rude imposition on users, and outside the "spirit" of Mac.