I have a 19" X-YBB which is too small and need a 20" frame. I purchased it in 2009 and it has been ridden for just over one season. I am 6' - 2" and sit on the fence for a L or XL. After a professional fit today, I am convinced I will be more comfortable (ergonomically) with a 20".
I would love to trade the 19" for a 20" or will sell the 19" frame alone.
I can provide pictures.