Not sure if this question was asked before but who here has sister locs? For those that do, what are the advantages/disadvantages to having them as opposed to regular locs? I've been reading up on them lately and I'm wondering, can they be done in greater thicknesses as opposed to just the really thin ones I'm always seeing? How often must they be tightened? I'm trying to make my loc decision and I need all the help I can get.