Awesome upgrade! Increases steering throw and is super crisp. I had to fail down servo throw on my savox to 85% because the links would bind with the drive line housing. I would highly recommend this to anyone looking for a all-in one upgrade. The down side and the reason for 4* instead of 5* is the drive shaft/axle has thrown the pin that slipes into the CV on differential. RcMart was quick to warranty it but after losing my second pin I'm going to drill and tap the pins in with a set screw.