Good upgrade. The only con is that these are 4.8mm ball ends and the original Tamiya screws are 4.7mm which gives some slack. Get as well a set of 4.8mm Ball stud set like YR #FB-4865 to tighten this up.
if your looking for the essential upgrades for your keen hawk/dark impact, this is a must have. no trouble getting assembled. very light and strong compared to the kit rods. they also make the buggy look really nice. i should have bought these immediately! would have saved time up front then messing with the kit rods.
This is a great upgrade for your df-03, the steel turnbuckles kept on bending and breaking. After i upgraded to these i have had no problems with turnbuckles giving up on hard crashes. They are good quality and easy to assemble with the provided tool!