The RFM I've been borrowing from the dealer has s-d. I mow with the chute up and it bogs down a little less, but I don't like having to pay attention which way I'm throwing the grass. Especially when I get close to my one neighbors house. Due to trees, a marshy spot, my lawn not being a perfect rectangle and other things, my mowing pattern is kind of haphazard, but I must be doing something right because I've knocked my mowing time down from 5 1/2 hours the first time to 2 1/2 hours by the fifth time. There are times though, when I find myself going the "wrong" way and have to make a conscience effort to throw the clippings away from the uncut grass. Can't wait for my rear discharge to come in.
Fred