I have a swisher with a "commercial" Tecomseh. Definately not a commercial mower. Mine is the 44" 12.5 hp with two wheels on either side, I've had it for two years.
I'm currently in the process of modifying it to a 4 wheel floater because it scalps very easy. After I finish the new frame, I'll mount it off the front of my JD345 and probably just use it for rough cutting. I can,t run 4 blades doubled because it has unique D shaped shafts. It has a relatively deep deck with thick metal, but thats the only positive aspect of it.
I wish I'd never bought this particular model, but the ones listed from the new sponser mentioned above probably do much better because they have 4 wheels and may "float".
After I finish this set up I'll try to post pics. The frame is finished now, probably 2-3 weeks (have to remove snow plow and chains from 345 to get measurements).
P.S: maybe if we all ask nicely, the Administrators could get us a spell checker for this fine forum. LOL !!