Yes dragon. I have.... Wait a minute... I haven't died... My counterparts excluding 13 and such have died though... Anyway, I can access 18's memories. He had died twice, and I do know what the "other side" is like. First death was by Frieza, beaten then death beam'd through the heart. Painful... *Shudders*
And Hell isn't as bad as other people would imagine, though depending if you keep your body or not, will determine your experience.