Locally it is known as the Chenogo. It's not used in the winter months, and I believe can only travel fast in seas less than 6 feet. They are fast and have lookouts constantly looking forward on each side to avoid trash, logs, and other debris. I remember talking to a crew in training for the Fairweather (same design used in SE Ak) and asking them if they had any encounters with endangered marine mammals (sea otters, seals, seal lions). They kind of laughed. I have a friend who has dove on the Chenega to remove debris from the jet drives.
They are fast and come up on you quickly. Their wake is very different from what you would expect. It is a group of long period waves if you are 1/4 to 1/2 mile from it and there seem to be two or three sets of them, I haven't counted exactly since they don't normally pose a problem. They are easy to ride over even in a sea kayak, just some up and down.