I've been using it since it's release to the fast insider ring and at work since it's release to the slow insider ring. It does everything I need to do. Build C++ with GCC or clang. ssh client works fine (have not tried ssh server, but supposedly supported). Python, Perl work fine. Have had some UI issues with the console, but those have been fixed on the fast ring.

The team behind WSL is also very responsive to issues reported at github.