Yup, it's a well established truism at this point that if you need a stable system (or don't have excellent data backups) you should never install the .0 version of any Apple OS. And while many Cocoa apps should be forwards-compatible out of the box, if you rely on Homebrew it may be several months before the packages you need are all updated.

if you rely on Homebrew it may be several months before the packages you need are all updated.

A large part of software in Homebrew is already pre-compiled (bottled) for High Sierra:

    % find Formula -name '*.rb' | wc -l
    4363
    % find Formula -name '*.rb' -exec grep "sha.*:high_sierra" {} \; | wc -l
    3634

Most of the stuff that I have been installing the last one or two weeks was installed as bottles.

Good to know!

Obviously just 1 data point, but I've been on High Sierra since the GM candidate came out. Smooth transition - everything just worked. Nothing about my development setup had to change.

I’ve got a spare machine and will run it on first. I don’t do any dev on the box; it’s all remote. I use git client and macvim to update some markdown docs occasionally but that’s about it. Rest of it is on the end of SSH and via web.

You should be more than good to go then! Git and vim/neovim/macvim runs like normal. This has been one of the least dev burdensome updates in a while.

beta has been public for like 3 months, most apps have updated already.