I've had problems with the twofish lockblock where the velcro was thin enough that it snapped after about 1 year of use. I wasn't undoing and restrapping the velcro, it just tore where the velcro snap goes through the plastic loop to double back on itself. (Maybe I tightened it too hard?) I got the twofish cycloblock which uses thicker, reinforced webbing velcro straps and haven't had a problem. Have any of the lockblock and/or clone users also had this problem?