The concept makes sense and it really works. In my opinion they addresses three things really really well here:
1. Longevity - it’s got one speed - slow - but you’re not actually losing time here. It is slow, steady, and strong. 
2. Power- pretty much anything goes in and it doesn’t miss a beet. 
3. Functional - it’s so small and easy to clean. The ease of cleaning may be it’s best feature.