I put fina in my left pec, and winny in my right pec a couple weeks ago. It was sore a bit after not bad though. I think chest is less painful than bis or tris, because besides you don't really have to use your chest muscles that much in everyday life, but you are constantly moving your arms. For some reason, my left pec bruised about 10 minutes after injecting, and it stayed there for about a week. After shooting the quads, delts, and glutes for weeks, and getting tougher and tougher to pierce the skin, it's nice to see the needle glide in smoothly with no pain.