This is a decent strap, the only thing I noticed is that it doesn't work properly; Actually I don't know anything. I installed a 4" Niagara slot knife on it. Dropout is about .009" which isn't great but for the price it's good and works well.
The contact surface of the saw blade is fixed very loosely in the mandrel. I've tried several rip saws with this mandrel and they wobble in different directions. This is the only Shars product that has disappointed me.
This item is of average quality. Acceleration is terrible, but it's ok for the price. You can tweak the beat and set it to an acceptable level, but if you have real money at stake with a paying job, invest your money in quality tools, not this one.