About the only issue I have with it is putting it together. It shows coming with 2 little wrenches and it comes with 1. The instructions are bad. 2 pictures nothing labeled to show which parts are which. Not a problem for me but in general its badly done. There are parts not shown. Specifically doesn't show the lock washers. Most of the "assembled" parts are not tightened down. You have to go back and check all the nuts to be sure they are tight. Also both sets of tri-wheel stair stepper assemblies had one set of bearings loose so they fell out when I picked them up. Not an issue as long as you make sure to push it in hard enough to feel it snap into place. All in all got a 3 on this from me but when you put in that it appears like it will work otherwise as advertised will give it a 4. Time will tell if it stays a 4.