The wife and I have been there a number of times bringing our twin GSPs up to speed as it where. The girls are two now and hunting well anyplace we go. For us it was worth it, particularly last year, just to get them on birds. The wife picked up bird hunting and her first dog two years ago as well. Great exposure for her as well. I also like that I can leave the 206 area, get the dogs on five birds and be home by early afternoon if I can't go hunting for real that week.
My perspective, I am a very casual dog trainer; I learn more from them than I teach them. I killed my first pheasant, over my first shorthair, 46 years ago. So far this year my dogs have retrieved over 100 birds, in three states. I'm still convinced the dogs and I benefit from working there.
Of the fields we've hunted, L1, L2 and L3 are our favourites.