I'm probably somewhere around high teens bodyfat. At these levels it's no problem losing fat and gaining muscle. Probably anywhere down to around 15% it's no biggie. I've gained over the past three weeks a small handful of pounds. My waistline has reduced despite what I hope to be some growth there from deadlifting, squatting and abs work. My wife says I'm looking both bigger and slimmer.
It can be a juggling act with the food but I don't count calories and I'd be astonished if any BBer were to call my diet 'clean'. I just try to eat sensibly and avoid feeling hungry. No aas needed beyond what I can persuade my own body to produce. I'll also happily hit the kebabs after a gruelling session.