Pros: 
- Easy to adjust to different difficulty levels
- Far quieter than other similar toys out there.
- Aesthetically pleasing

Cons:
- Silicone is not very durable. Several holes, and pieces of silicone coming off as choke hazards after only a few uses.
- Unscrews itself open during use very quickly and easily which defeats the purpose of keeping my pet occupied long enough to finish another task in the home. I have to keep rescrewing it closed every 1-2mins.
- With these cons, is not worth the cost.