If you're carrying enough weight in an Andanista to overload its suspension system you're carrying way too much weight.
I've used this pack extensively on multi-day climbs in Alaska and Washington and its been great.
The only negative thing I could say is that it isn't very durable. I don't like taking it on sub-alpine climbs because it gets thrashed in the brush and shit.
I'd say its best for snow and ice climbs.
Also, the Andanista slims down really well for summit bids, technical climbing, etc.