There is ONE problem with my Big Hac. Gigabyte, who made the motherboard, did something wrong with the BIOS software and as a result if I put my Hac to sleep every night for a week it's going to crash due to a memory leak (I think) and make me lose all my data. Otherwise the experience is super-smooth (true, once you spend a week fixing everything, but after that week there are no more problems). Updating the OS consists of: downloading update from Apple, installing it, booting without NVidia GPU to a terrible built-in Intel GPU only to download NVidia drivers, restart. When one considers this has saved me more than 2 thousand euro, I'd say it's worth it.
I'd love to buy a new iMac but Apple tax in this case is so shameless I just can't justify the spending. My 2015 rMBP is totally worth the price I paid for it. It's the best laptop I have used in my life, period. I saw hackintoshable laptops but none of them look half as good (not to mention trackpads...) as the rMBP. My husband's iMac seems to be on its last legs, and I told him not to even look at Apple page, I'll build him a hackintosh. BUT – if the Mac refresh actually happens, and the computers get actually improved – especially in iMac case – we're ready to pay up to €2000 for a computer without a spinner drive and with 16 GB RAM. I won't say "upgradeable" because nothing Apple make is upgradeable nowadays and I know that. But hubby isn't exactly technical and I think doing that simple El Cap upgrade would be something he'd need professional help with (both to do the update and make sure he doesn't develop Hackintosh PTSD).
Coincidentally though, I am starting to think warmer about the thin rMB, even with its **** keyboard, because Amazon have very interesting prices on the 2016 model. I don't NEED it, but it's purdy. Make our rMBPs pretty, Jony. Like "OMG THAT IS SO PRETTY", not "wow, it's thinner now and lost all sockets except for USB-C – in rose gold". Make our rMBPs fast, whoever-is-in-charge. I have my new Hackintosh in basket – buying parts I checked will work together would cost me €1800 and beat ANY Mac that is actually produced at the moment. Make me give up that idea, Tim. At least I am 100% unlikely to buy a Dell, so that's a bit less work for you.