I'm a longtime Mac user currently considering switching away from the Mac. I'm a little sad about it and I don't feel entirely like it's by choice, but it is what it is.
This switch is partly in response to the direction Mac OS is heading, but mostly due to hardware cost.
I genuinely dislike Apple's emphasis on thinness in their laptops. I genuinely can't afford to spend a minimum of £1,200 on a 13" laptop that's essentially glued shut and has no upgrade path at all.
Previous Macs have given me ~10 years of use each because I've been able to buy a configuration I could afford then gradually upgrade the RAM and replace the hard-disk as I needed.
Add to that the fact that the cheapest 15" laptop (the size I prefer) is £1,900 which is totally galling and puts it way, way out of my price bracket.
As a result, I'm actively looking for where to move when my current MacBook, a 15" from 2009, eventually dies. So far the best options seem to be a modern-ish ThinkPad, which I can get relatively cheaply second-hand and upgrade as I see fit. The ThinkPads are definitely not in Apple's league in terms of fit and finish but they're pretty hardy and give me options within my price range.
I'll be sad when I finally leave the Mac, but not heartbroken. There are lots of things I'll miss, but getting to know a new OS -- and hopefully switching platform for the last time -- will be an adventure.