Works great!
I highly recommend them to any mid-quad.
I found using a J2 Deep Contour back made all the difference. No more weeble-wobble! Also some hatch quad gloves help with traction on the push rims.
After 1 week I was confident with them. I still have trouble going up the ramp into my Entervan, but that is partly due to my EZ-lock getting in the way. 1 warning, they are W-I-D-E. My 18W quickie2 w/ E-motion wheels is almost 2 inches wider than my 18W Ranger X.
They will give a workout to someone who doesn't lift weights.
Get an extended trial fropm your DME rep, you'll love 'em!