Yup, they're not cheap - and neither is an Airstream.
Only had mine to the mother ship for repairs once - last spring, and they did what they said they'd do when they said they'd do it, for the price (actulaly, a little less than quoted) they said they'd do it for. Professional all the way around. They really know what they're doing, in my estimation.
Now, anyone can repack a wheel bearing (even yours truly!), but when it gets into the deeper mysteries, I lke the idea of having the pros do it. There are probably cheaper places out there, and there are probably techs who are just as good somewhere, but I'm personally not sure where, and it's a good feeling towing away knowing the job was done right. To me, the peace of mind is worth the extra few $. I think they're as close to a "10" as you can find.