These pumps are
A) unproven in longevity
B) using stolen technology and appearance from Tunze
C) are cheap Chinese pumps using cheap parts and cheap labor produced by the same people that produced the lighting fixture that was prone to catching fire.
There is a reason they are not readily available through any LFS, and no guarantee on them.
We can't really make a comparison between them and the MP since they offer no guarantee or customer service for you should you need to contact them.
So far, the only thing I can see that is impressive about them is the price point. But if they only last a year before you need to replace them, then you'd be losing money and patience I would think.
There are also many people I have seen pulling them out and selling them to put their old power heads back in for whatever reason.