First, I'll say that it's a worthwhile trip just to see the glaciers from the top, as it's totally different from seeing them from below. That alone made the trip wonderful.
However, Coastal Helicopters has their process set up like a conveyor belt pushing through visitors like going through a mechanicized machine. I assume it's probably no better at the other big helicopter tour operators but my experience was not made enjoyable by their staff most of whom are just 20-somethings making some summer cash and who don't know anything about customer service.
The pilot seemed to be on auto pilot and said hardly two words during the trip up and back. He was anxious to tell us what an expert he was on top of the glacier but was then annoyed when our group didn't rush back into the helicopter as quickly as he wanted and actually seemed miffed on the way back down.
The whole experience was very impersonal and left you feeling rushed through the process. It was fun, but not because of any efforts made by the Coastal team.
It was expensive but I am glad we didn't pay any more than we did (i.e., we'd wanted to do dog sledding which was twice the price but it was too warm so that was cancelled) and I would not use Coastal again althogh I'm sure all of the big companies are probably similar in the experience.
They just rush you through the process without any personality. Positively they have it down to a science, moving a lot of people through the various steps from pickup to weighing you and fitting you into boots and such but there's a lot they could improve to make it a more enjoyable experience!