I used to take a T3 with a pill everytime, about five or six years ago. I used to get this extremely detatched/disassociative type buzz going. I would literally get lost in my own mind. Intense CEV, and very bouncy feeling. Went for drives (sober driver of course), and would just literally feel like I was on a boat cruise. Simply amazing feeling.
I stopped when I let a friend of mine try it, and he wigged the f-out. He was damn near clawing his eyes out. I guess it's not for everyone. He said later that he was having these extremely intense feelings of being satanic, and it worried him almost to the point of harming himself. I guess it was his strict Catholic upbringing, that was pounded into his mind.
When I first started pinging, I used to ride the H train almost everyday. I would take the pill first though, like it was stated previously. I found it quite enjoyable if you don't plan on moving too much. I would get nausea very badly if I walked around too much.