I shoot 400mg of T400 with 300mg of deca every 3 days. NO PAIN whatsoever. I personally think its all about the way you inject. Clean, slow, and steady. If you inject too fast, anything is going to hurt. In my opinion, the T-400 isn't all its cracked up to be, I noticed more gains with Enanthate, It's just nice that you get 400mg's in 1 cc.