It does fit well, is very stable, is very quiet, and can get going quite fast but has enough friction to slow properly as well (not a flywheel lol)
Our chinchilla loves it, she uses it all the time and the large width allowed her to learn to use it without any wipeouts.
My ONLY complaint with the product is that at this price point, I would have assumed a simple hex key would have come with the wheel to adjust the brace itself.
This is a high priced product but it is well worth the investment if you are looking for a safe, easy to learn, stable, and quiet wheel.