I find Safari's devtools to be quite annoying, but to each their own. Firefox' dev tools still hold the crown for me.

The lack of cross-platform support is also annoying to the point where I generally don't bother testing on Safari unless I'm absolutely forced to. Until Apple releases a Safari build for Windows and/or Linux, Safari users will just have to rely on Safari's compatibility with cross-platform browsers.

The open source version of WebKit works fine as a user, but behaves differently from any official Safari releases, so as a web developer it's not really usable as a testing tool.