Fist let me say that the staff at smart wheel are great. My pads took longer due to shipping and with a simple email the staff will keep you up to date. I am a new EUC rider and purchased the KS14D wheel from Smart Wheel as my first wheel. All the Youtubers are correct learning curve is huge but once you get use to your wheel it is an excellent experience. Once you get use to riding and gain confidence in yourself and the wheel adding pads is highly recommended. As your riding experience progresses, you will want to stop faster in public places among pedestrians and cars. The ability to lean back and feel that back pad helps with stopping a bit faster and with more confidence. Highly recommend purchasing these after you learn. You need to get use to the wheel it self first. Why after, learning the wheel is enough to learn at first .. as mounting is the biggest learning curve.
Purchased for Kingsong 16XS, makes a huge difference in my comfort and control after starting up again this season, highly recommended for anyone on the fence about it.