I find when I use other people's computers they're often so slow as to be painful and the person who owns it doesn't see what I'm getting frustrated about.
So these people that want a £200 Macbook, and end up with a 2008 Mac for that money that is, to anyone like us, horribly outdated and slow, are actually perfectly happy with it, because they've only ever had ****.
I'm a Mac user, have been for years and years, and I'm willing to spend the extra money for them because I'm a big fan of the OS and I know it way way better than I know Windows. But if I found myself in a position where I had anything less than about £1200, and I needed a new computer, I'd build or buy a Windows machine because IMO any Mac old enough to be cheap is way too old to be nice to use.
My laptop at work is a reasonably good Dell but I still don't really like it, just because of software preferences. I haaaaate using it as a laptop, it's fine docked, but I do think Mac laptops are much nicer in terms of physical usability than Windows machines. However I have never really used a properly flash Windows laptop with a very nice, large, modern trackpad etc.