If you are going to actively chase autocross and road course events, its worth the money. The kevlar lined heim ends allow less bind in roll [when cornering] and have little if any increased harshness. They stay tight and quiet for tens of thousands of miles.
If you're a cruiser, the poly is just fine. There is no difference in strength so no need to be concerned about that.
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Bret Voelkel
President
RideTech
Air Ride Technologies, Inc.
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