Its pretty good indeed

In the later versions its even possible to write new compiler support in XML format instead of modifying the source code.
it also supports the ARM compiler

Im in the process of building a new package to get rid of some rather annoying bugs i ran into with a few of the compiler tools.
One was that while the mingw64 version of git builds just fine the gui part had some rather irritating bugs caused by the mingw64 version of aspell, so i removed it since git works just fine with the Msys2 aspell

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Another was a problem with a plugin to the python interpreter causing it to crash, turned out one of the packages didnt copy a needed file on install sigh.
now you have two possibilities if you want to use git from a gui interface since i also installed git-cola which uses pyqt4 instead of tcl/tk hehe.
gcc was rebuilt from scratch with a few last minute changes,
it defaults to linking statically to both libgcc and libstdc++ but in some cases you might need to link to the dynamic versions so i added a new switch in gcc/g++ "-shared-libgcc" and "-shared-libstdc++"
python for one cannot be built with the static runtime (crashes at runtime if you try).
it also checks for windows executables by default by doing a search for files ending in either .com .exe or .bat,
just to avoid some autotool based sources from getting funny and try to install extentionless executables ala posix world

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Oh and Msys2 git now finally has a gui as well, sadly enough to avoid having to use X i had to resort to crossbuilding tcl/tk with mingw64 and use a few cygwin hacks to get it to comply,
but it works like a charm now so who cares

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Productivity is a state of mind.