Well, do you? Are you getting along with them good? And what is their flaws and pros in your opinion? I myself just knows a very few ESTP's but I've never been close friend with anyone. I admire them, and I tend to idealize them alot. I really have an easier time talking to them then ISTJ's because we seem to have the same attitude when speaking to eachother, ok maybe I'm not as direct but they often make me focus on what makes sence, and not in that sort of intrusive way of ISTJ's. And when I've verbalized effectively I know I've been understood by them (you, if you are ESTP), making missunderstanding hard between us. Yes I have to force myself to be more direct (and realistic) but I know It would be worth it in the end.