I agree it's ymmv. i have fresh installed on my base '12 mini several times and after about 1-2 days it starts messing up. Spinning beach balls for long periods of time, have to rebbot every few hours, constantly hung downloads in the mac app store, but most of all lag and spinning beach ball. Seriously, I had a dell laptop that I got in 09 and this is much worse even now (gave it to one of the kids when I got this one) my wife's 09 samsung laptop also is smoother. I like osx, this is my first mac, but it's getting very irritating. I have been running computers since dos and have not experienced this much trouble since windows 98.
If I could go back to mavericks I would, but I do not have mavericks in the store even though it came on the mini.