Highly recommend this part over the HPI aluminum part as it will eventually lose grip and wear out overtime.
Comparing the YR part to the HPI one the YR is better constructed and it has a groove to lock in your pinion setting. This makes it way easier to do maintenance as well as when you need to check the spur and pinion gear as the hex screw does not get in the way.
I would consider this as one of the essential upgrade parts for the E10. The stock plastic one doesn't hold the motor in the optimum position for long. Before I had this installed, I was practically tightening the stock one every other ride or after a big bang. With the Yeah Racing mount, it is very very secure now and I have yet to tighten it.
The bad part about this is lack of instructions and difficulty of installation. There are 4 screws of different lengths, figure it out first before screwing in. I thought I got it right the first time but motor couldn't move cos one of the screw was too long and it was blocking the motor movement.
Anyways, here's how it should work:-
1) The shortest countersunk screw is to be used at the chassis bottom to hold the "bridge".