I've been using Crown mixers with Honda motors for several years now. I wouldn't want to use anything else , I love them.
This is the one I bought last year, and I have another that's a little bigger. I'm down to two now. I had one stolen , and one of my guys flipped another one down the road.
Talking mixers,here is a gadget I never popped for back in the day,now they are not made . Looks kind of handy for loading mixers.
http://www.masonryconstruction.com/Images/Sand Measuring Made Easy_tcm68-1374911.pdf
Many moons ago,every mason wanted an Anchor mixer (no longer made) I have several Essick mixers (no longer made)