I have it. Works fine, but it's less practical for brakepads than horizontal or track dropouts. You'll find yourself adjusting the brakepads often. Provided that you have a rear brake. I ride SS, so I do. Oh yeah, freewheel removal can be hairy - you can't count on the axle to stabilize the freewheel puller. So while I like the bike on which I have the ENO, I know I'll have to destroy this freewheel when time comes to replace it, and all in all, I decided this is the first and last ENO eccentric I bought. The ENO is not heavier than a normal track hub, and it is in all rideability aspects identical.