They seem fine with health tested parents and some good looking pups.
The only draw back I saw on the website was on the about us page. To me when breeders start talking about the price of food for the parent dogs and the training and crop/dock when the parents was a pup and thats why the price the way the do... that stuff just leaves a bad taste in my mouth (I'm sure alot of people don't have a problem with it.)
If you are looking for a working line boxer you can check out the usabox.org site and under member sites they have some kennels/breeders listed.
Best of luck in the search.