Hand-holds are always nice. I was so surprised to find one on Cows with Guns that I lost concentration and fell off.
Back Wall is well worth a trip. Second trip will be better now I know where to go. We had it all to ourselves, no surprises there. I was a bit surprised that we also had the the Hump area to ourselves as well. The weather was absolutely perfect!
I'd recommend that you check the topo in the Boreham guide before climbing on Back Wall. The new photo topo has a few critical areas in shadow. That said, neither beats going in there and getting it wrong at least once. There is heaps of unclimbed rock in between the bushes and the views are great.