I tried to use it when writing my article. It could not even load my initialization file because it is not standard compliant (it does not support the :VERBOSE argument of COMPILE-FILE).

The fact that they use GCC under the hood is interesting though, I'd be curious to see how fast it can get. But standard compliance comes first.

Never heard of anyone using it. AIUI not standards-compliant. LGPL for a Common Lisp impl. is not something I want to touch with a ten foot pole.