No, in general, they don't. Very few Apple customers are satisfied, and that's exactly what Apple wants; a satisfied user doesn't upgrade. I say this as someone who's quite satisfied with my HTC One (M7, not the M8 that came out this year) and iPad Air, but becoming less and less satisfied with my 2011 (e.g. aging hardware) 17" MBP, but sticking with it because I'd be less satisfied with a smaller display and I'm not yet so dissatisfied with it the switch back to a PC.
To put that into perspective for you, I wanted the M8 when it came out, but the M7 still satisfies my needs; I can't justify the upgrade, so I don't spend the money; if I weren't still satisfied with the M7, I'd have the M8 and HTC would have made more money. Likewise, I'm satisfied with the iPad Air, which is probably good as it's the newest model, but I'll likely remain satisfied with it for as long as it can run the newest version of iOS (or at least the version required for the apps I use), so Apple won't get any more of my money, which they want, there. As for my MBP? Well, Apple could have my money, but they quit making what I want in a laptop, so I simply remain unsatisfied.