The SilverHandle is bar none, the only handle you'll need on your one wheel, 20 seconds to install and a lifetime of thankfulness from your hands. I had a long trek home from a dead battery and this handle TOTALLY made it not suck. Can't recommend any more than I do.
The Magnetic Fender is a one of a kind fender that allows you to pop off your fender in seconds to do big stunts or if you're just going for a naked look. INCREDIBLY durable in my opinion.
The Kush Hi is an awesome footpad that increases your ability to do big carves on the road without worrying about slipping grip. It's helped me with my 15 mile rides with close to no foot fatigue at the end of the ride.
The floatplate is just dope. No more wrecks from the quick nosedives from sharp turns. It just slides on the ground and easy to get back to balance. My nosedive anxiety is gone!