I have used them,, they are great props well made,, and as you noted, balanced well also
My problem was finding a setup that my airplane liked,, on my attmepts,, they did not seem to have the same drive as the apc props,,
but my airframe was a bit heavier than optimal,, your mileage may vary,,
I bought several different sizes,, still have them, now I use them on my RC stuff, they are pretty efficient too