The rear wheels are cheap, fairly small and don't turn very well. The plastic knobs to lock the rear wheels are also cheap, a bit hard to turn, and will probably wear out soon. The front wheel's caster hardware is also flimsy and 2 of the 4 carriage bolts broke off during assembly while I was tightening them.Keep in mind that this is a tricycle design. As such it teeters a little so be careful not to apply too much horizontal force. Also, the front wheel is a caster type roller and even though you can keep it from rolling, you can't prevent it from twisting.This base is only worth half the price being asked for it and I recommend it only if you cannot find an alternative.