Easiest trick after the frontside 180 in my opinion...once you learn it. if you commit to it, even if you dont make it around all the way it shouldnt hurt..usually. (btw I guess I should say I am talking about the wildcat style) Never really liked the style of the back tuck ones, but everyones different. I think wild cat is the one to learn cause once you can do it, you can do it off of anything, you pop a lot. So for me and a few friends we could backflip a lil kid jump/mound at 1ft tall to a flat landing, or the 70footer, makes no difference in difficulty really.