Agreed with compounds as well as each persons individual physiology.

For me TestCyp, Deca, and TrenA caused absolutely no pain during or after slow injection of warm solutions. Prop with no EO on the other hand hurt like hell the next several days after injection, even with a 50/50 Ethyl Oleate/Grape seed oil base it caused mild pain the next day.

So if its a long ester and properly made you should be fine.