i use geckoes because i have sensitive shins ( i used to climb with buckinghams with soccer pads underneath). I like them but i don't use them everyday, i think they might wear out with daily heavy use, but for my purposes they are heaven. by far the most comfortable not to mention lightweight gaffs i have found yet. but they aren't the most heavy duty, and could have a tendency to kick out in punky wood, i keep them sharp and they work very well in hardwoods especially.
another reason to tie into the center ring on your harness when topping is if the spar splits it is less likely injure the climber than if tied to side rings.
no first hand experience here but mike maas brought this up in an earlier thread and i thought it was worth repeating, its something i've been trying to do(when i remember).