Off ice spinner - product recommendation?

I've been trying to improve my spins and my group lesson teacher recommended getting an off ice spinner. Do any of you have any recommendations on a particular type?

On Amazon it appears there are two types - a stationary platform that rotates on itself
(eg.: http://smile.amazon.com/Metal-Skate...091699&sr=8-4&keywords=figure+skating+spinner),


or a foot-shaped thing that spins around on the floor but allows you to move a little bit, like you might on the ice:
http://smile.amazon.com/Skating-Tra...091699&sr=8-3&keywords=figure+skating+spinner


Have any of you used any of these types of products, and do you have a recommendation for a beginner?

Thanks!

I have the second kind and it has helped me a lot with dizziness and working on my overall posture, body position, etc.