I have it and love it, it's a blast to drive with moderate power and tires. I haven't tried it full tuned yet, only in <400 HP restricted races online.
To answer your other question, supposedly about 8% of users on the mygt garage site have it. I don't know how closely that relates to GTPlanet users though.
Im talking about the cusco subaru, AWD in the dealership but RWD in UCD. As a drifter I snapped up the RWD suburu immediately. And is now one of my favourite drift cars