Kinetic by Kurt Turntable Riser Ring

My unit arrived missing some nuts and falling apart. I had some spare washers and nuts that were the right size to repair it, but for the price I'd expect better than 'old thing I found at a garage sale' quality. In addition, the rubber feet underneath are on the small side - so while they help it grip the floor or mat surface a little, it's not enough. Some better and more tacky rubber underlayment would improve it quite a bit. The friction of the bearings is about right, though - a little coarse, so your bike wheel still feels controlled but you can turn the bars more readily than bare floor. Overall, I'd give it a 'meh'. If you can find a used one cheap, that might be the way to go.