I like the Ropeman 1 but since switching to 8mm rope I’d like to switch to a CT or Duck. Using a distel on both lineman’s and tether for the time being and both seem to be working just fine. Just want to have the option of a mechanical ascenderNever used a roll n lock. Kong dock and ropeman are great. I like the way the carabiner connects to a ropeman vs duck.