Does anybody use this device? I was looking at one in Basspro and it seemed fairly simple put I wondered about the the stops that were clamped on the cable. It seems to me if ever one let go it would get real interesting. Also do these portable presses ever harm a limb? If I get some good feedback I will likely pick one up as a bench one just does not make sense for the use I would get out of it but would like the option of doing some tweaking myself.