The Stealth models didn't do anything for my Liberty compared to the stock stuff, so I'm anxious to give these new Ultras a try.

I do know that the the "double split limb" version of the NAP ThunderBlox was quite good compared to the stock Stealth Sims on the Hoyt bows I've shot them on. Did lose a couple of FPS, but it was worth it IMO.

NAP Thunderblox