The 36" walker mower! I have saved myself so much walking on small lawns it's not funny. I did 9 in a row this morning with that little walker and just had a grin from ear to ear with every back yard gate I was able to sneak through. I'm sitting down and catching the grass like it needs to be done. It even traverses hills really well, which was a suprise to me, I thought it wouldn't climb well at all! My small lawns that I used to "cheat" on and use the 50" ZTR on the front and then have to walk the back I can now cut with one mower. The walker dosn't leave turn marks in wet soil like the big ZTR can, and it lays nice stripes for the small lawns too. The mower is a model S, which is only an 11hp kaw. Suprisingly it has ample power for most jobs. Like all walkers, they aren't speed deamons. Reguardless I'm able to cut as fast as I need too. Some lawns are soooo bumpy from the nightcrawlers you just can't go too fast... lol.