I started my thru in '09 w/ the 70. It was obvious that I was MUCH heavier that most others. I changed to a ULA Catalyst in Damascus and couldn't be any happier. I used the Catalyst in '11 on a SOBO and it only confirmed the choice. Lately I've moved to the UL camp, but I keep looking longingly at the Catalyst fot the upcoming '13 hike.