[Blink]

Second is the need for an AppleID (which I refuse to get) to get Xcode and update shit.

I certainly agree with this. If I had a Mac, I'd do (more so not do) the very same.

What's It like In terms of overall compatibility with Linux, meaning have you experienced any significant Issues with applications/tools (binary) and the like?

I can't run any GUI tools from Linux, as OSX doesn't use the X window system. The binaries aren't compatible as OSX has a different kernel, but there is alot of tools that can be compiled (most things) or grabbed from macports (a BSD-style port system that has like 14k packages) and homebrew (another package manager).