Ya I hit lats regularly. Rarely bleeds, rarely painful. Although one time I was pre heating my syringe under some very hot running water. And I lost track of time (stoned and youtube) SO by the time I injected it into my left lat.... HOLY FUCK! Hot oil injections could have been used as torture tactics lol!

Its a good spot though, I usually rotate quads, glutes, lats, chest. Chest is kinda intimidating at first, and is a little painful but not bad. Its my least favorite spot probably.