I've been to some of them. We've only bought a bull from them before. Their females get up pretty high, but as with most sales you can find decent priced, good cattle on down the line. They are good people to deal with.
The Buck's have been great supporters of the Jr. program in the Maine-Anjou breed, they have built a successful show program around youth. Like with any program that has a highly successful program and consistantly produces winners you will pay for what you get, just do your homework and be prepared going in.