Honestly I dont feel they are worth what you pay for them. I bought mine used but will proably resale it on here as its more of its good looks that actually doing anything, I think my 20 dollar S-coil did more for vibration, but thats just me. If I was gonna spend that money new I would get a Extreme Stab, Posten, or a B-stinger that actually helps stabilize the bow and the Xtreme has a interchangeable weight system to accomadate your shooting