The only place I can shoot is in the glute. Yeah yeah, call me a pussy if you want but hey I TRIED one in the quad, and yes it sucked! Damned bloody mess, and for some reason after I aspirated, the plunger wouldn't go down! I finally had given up after like a minute of pressing as hard as I could and went to pull it out and the ZAP, all at once in it went.
But yeah bro, glutes are always prime. Not to mention they can take a beating and it won't hamper your lifts as bad a another site injection might. And yeah get some extra pins. Even when you poke it through that rubber stopper, it dulls a little. I always chang pins so its fresh and sharp.