We used them last August for Caribou. They run a top-notch operation; we came away very impressed. Communication was great and even when the weather threw a wrench in things, they worked their tails off to make sure everyone was taken care of and into the field as quickly as possible.
I looked into them and a few others in the brooks last year. I just couldn't get behind the prices those drop camp guys were charging. One of them wanted like 11K for a DIY drop caribou/Sheep hunt.
I know the logistics to the brooks is a lot more than the other ranges but the air taxi prices in the other mountain ranges are a much better deal.