I bought one of their fixed stands this year, that may be the predecessor to the copperhead. I love the fang attachment but I am not real happy with the seat arrangement. It seems very awkward to turn around with very limited space for your feet because of the fixed seat. I am 6'4" and 230 #. I also bought the climber, Viper XLS, and find it excellent but heavy to carry. It is as stable as a permanent stand.