I use the McKenzie brush on as well. Works great, but just like all tans if you dont prep the hide correctly, ie... remove all meat, membrane, fat, and shave thin enough then it wont work as well. I have also used a few others including Krowtan. Its a matter of preference really, how fast you like to work and the options you have for discarding the pickle/tan like Krowtan. I have found that the brush on tan works great as long as the hide is properly thined. Thats my 2 cents worth.