Bro, Im getting ready to hit delts tomorrow...  no big deal, 25G 1"  there is some soreness afterwards, but nothing too bad.  To be honest, Ive found that I LOVE injecting into quads.  Mind you Im only going about 1-1.5CC, but quads are da shiiit.  Minimal pain, and easy injects with a 25G 1".  I know some bros hate em, but for me, they're smooth as silk so far.