The HMF slip on has more grunt down low, but the full Yoshi has better overall power everywhere else. Ran them up Utah's Sand Mtn and the full Yoshi seemed to pull a little more. The HMF is still a great deal and if your a woods guy you won't be sorry..I reeled in 5 DS's and 3 Raptors on the flats yesterday. We all raced at once and the Z won most of them. I wasn't running paddles, because they're over rated!! My Cannondale couldn't pull top gear w/ paddles and geared 2t smaller on the rear. People were surprised how well the C-dale did too...I beat a few Raptors and Ds's up the hill w/ no paddles and I gave them a head start. I did lose also. Can't win em all!!!