I was reading about them they said it makes it easier to steer is there any truth to this ? And if you are runing one is there any thing to know about them ?

On the GDSD - steering feels no different from the 2 to the 3 blade to me....

3 blade is stronger out of the hole and in the mud - bit less vibration - and
when it gets some significant wear the 3 blade has more lift than the 2
so prop "blow out" is a tell tale when you need a new one....

On my rig which is small and light the 2 blade is just slightly faster solo - but
most larger heavier rigs say they see the best speed with the 3 blade...

I believe it is the GD 3 blade or a variation of it that is now in use by the
smaller PD MMs - so performance might be similar for them too....

A guy in my area likes it for his older 25 PD on a Gator Trax - said he got
a bit more speed with loads and better holeshots....

3-blade is awesome for getting up quick. Ive never ran a 2-balde but heard 2 blades do run faster. 3-blade runs better with large loads