I recently bought my first YS after lots of OS and Saitos. It is a YS 110 FZ. Numbers on MA k-type 16x6 prop are as following:

OS FS-120 Surpass III peaks at 8,700 rpms on 10% to 15% nitro.
Saito FA-120s peaks at 9,100 rpms on 10% nitro. (Saito 125 is a little weaker than this)
Magnum 120 FS peaks at 7,900 rpms on 10% to 15% nitro.

YS 110 FZ peaks at 9,600 rpms on 20% nitro. At less nitro it is not working properly.

As you can see in peak performance YS is the strongest. What you can't see but only feel is YS transition. It throttles-up like a rocket! It really worths the money. It is also 200 grams lighter.

My only concern for YS is how long all these pressure gaskets will last.

Stelios