Use in my 90mph run with just 4S batteries on the Goby 180 Extreme, these props are the way to go if you want to go really really fast.
The re-designed skinny blade tip is more aerodynamically efficient at high speeds and the decreased tip surface area is compensated by increased girth in the middle of the blade. So you get less turbulence at high speeds and similar thrust. Cleaner air flow = easier to go faster.
Plus they are just as unbreakable as the regular DAL props, so you can't go wrong here.