I've got a Cobra XLS and a Viper XLS top to go along with it; that way, I've got the best of both worlds. I will say that 99.9% of the time, I take my Cobra top along. Really, the only reason the Viper top sees any use any more is if my father comes along with me; I like to let him use that top so he can just sit on the bar and stand up during his ascent. Like Matt pointed out, it's much easier to climb with due to that aspect. The Cobra requires leaning in and placing all your weight on your forearms -- no problem for me, but Dad's over 60 now and hasn't done much of anything physically exertive in a long time.