Straight to the point, I wouldn't buy this today if I didn't already have it.
The plastic rings that you can choose to the size of your finger is a nice idea, but since they just rotate freely is hard to control and one side of the slide is open, it sometimes just rotates over to that side midst playing.
It's really just a hard to control gadget. I would go for a regular straight pipe slide instead, which is what I use instead anyway.