The first photo on this thread:
viewtopic.php?f=11&t=38539shows a 6-foot man fitting well in a Revo 11. So it's possible. But people of the same height can have different leg lengths, so if you're tall, it's probably best to demo the boat before you buy, and find out if you are comfortable in it. Not easy, I know, on our side of the Atlantic, because it takes time for the dealers to catch up with the latest boats.
I'm quite heavy, but at 5ft 5in, I'm happy that the Revo 11 will be a good fit for me. I'm probably going to get one, but not until I retire in 2013.
From what I've read, I don't think of the Revo 11 as a kid's boat (although I expect it would work). It carries a good payload. But I get the impression that it won't be ideal for very tall people.
Mary