My experience with caddies at Bandon has been a mixed bag. The first time I played Bandon Dunes, someone else's caddie started giving me advice and it became clear that he knew golf and knew what he talking about it. He was great (I forget his name) and I tipped him after the round.
Then, when I got a caddie on my own on another trip, my caddie was nothing more than a porter and an indifferent one at that. I still joke about this caddie's green-reading skills. No matter the putt (it could have a three feet break), his read was that it was a ball outside the cup either right or left. I should have told him not to bother but, instead I let him scout out the putt, give me his uninformed opinion, and then I dutifully ignored it.
I agree that the unencumbered walk down the fairway is nice (if a bit strange), but there's something about having eight people in a group that's a little unwieldy. Sasha looks like a keeper, but I generally would recommend against caddies at Bandon.