I use it on a regular basis, especially if the bike has been sitting for a while. I also put a good amount in last fall. If I know I'm going for a decent ride, like around Mount Rainier for the day in the summer, I'll usually put some in.
I also usually put a capful of Marvel Mystery Oil in the tank during the summer.
My neighbor who lives across from me is a petrol head mechanic and fellow rider. He swears for Stay-bil as a fuel stabilizer. I haven't tried it yet.

Blue/White 2007 TBA, Thruxton needles, Unifilter, AI removed, Polaris Bellmouth, Bubs, Nology Coils/wires, Lightbar, Ricor Intiminators, Hagon Nitros, Tall Sissy Bar w/luggage rack, Dart flyscreen & Lowers. 130 Mains, TrueGel Battery MG12-BS.