It's what I do, ThinkPad T420 running OS X Yosemite.
I actually wrote about my experience: https://medium.com/@Ezhik/2fb487efe717 - but even disregarding obvious concerns like legality, there's still plenty of reasons to want to give Linux a shot properly, which mostly come down to the direction Apple is taking OS X and its hardware in.
For what it's worth, I've been using my Hackintosh on the same hardware since 2011. It'll be 6 years in March. Just upgraded to Sierra 10.12.3 this morning, in fact.
On top of that, I've actually had to spend far less time computer janitoring it than I have on the various *NIX installs I've run in those same 6 years.
I totally understand not wanting any OS-based surprises while trying to get work done, but as long as your CPU and motherboard are supported, you're generally good to go.