I have only tried one MAS in my life... a 16x8... it was noisy, it was flexing like hell when I gave full throttle (blade tips moving forward close to an inch I guesstimate... I didn't dare to look at it properly from that angle... scary), and it generally sucked in the air. The only thing it had going for it was static thrust: it gave more static thrust than any of the props I tried on that engine.

I settled on a 16x8 Mejzlik afterwards... I can now hear my engine running... and the plane actually flies quite satisfactory. When I first took it up (with the MAS), I thought: what a dog of a plane. I'm glad the landing gear ripped out during an emergency landing... it broke the MAS too... switched to the Mejzlik after that... what a difference...

Now I am not saying they are BAD props... I just say that in my particular case, the MAS sucked. And I tend to extrapolate experiences...