I'm a dev. I'm not afraid of some shit breaking. The day that I'm afraid of shit breaking on machines which only affect me (and have no alternative plan!), I should quit being a dev. Because chances are, that shit broke because of me (:
But honestly, though, I use the Win10 fast ring on my work machine (and 1/2 the dual-boot at home). Updates at least once a week -- and the current builds boot mofo fast and are more responsive -- so I'm getting a pay-off.
If something goes super-south, I can always find respite on a secondary machine (my laptop, unused workstation at work) because the code is not isolated to my "primary" machines. My development environments are available on all machines that I can access (or can be installed trivially).
I also use nightly CM builds on my phone -- because, if worst comes to worst, I can restore (from Titanium Backup) onto a prior build which I can download at anytime; time cost: around an hour, of which only about 15 minutes actually requires my attention. Once again, I get a pay-off: my ancient i9300 is running the latest Marshmallow builds and hasn't been faster (or more secure).
The cry to avoid bleeding-edge OS builds because of security is faulty -- where do you think the security fixes happen first? Certainly, I get to see the fix commit logs when I update my Android device. I also get to see them in Win10 build logs. I don't have to bother for Debian because stable is normally patched quite quickly for security threats.
I don't install previews on my pre-schooler's gaming laptop -- because then I'd have to maintain it. I don't install a testing Linux distro on my home machine's Linux boot because that has to (reliably) keep my tv series up to date and no-one wants to face the wrath of the wife when we don't have the current series (and I have, thanks to some creative fuxing by Poettering. I used to run Ubuntu latest (and before that, Debian testing) when there weren't people hell-bent on breaking the fundamentals of the OS).
But on my machines -- hell yes.
Disclaimer: I am a complete Update Whore.