I ran a RIP TKO with a podium insert/outsert and and IW collar. It's not a HIT, but the insert extends out the arrow shaft and still allows a collar. I bought the arrows used on Rokslide with all components already installed, 50gr titanium with IW 25gr stainless collar. I can swear by the durability. I absolutely destroyed the front leg bone of a Red Stag on a missed shot. The arrow held together enough and did break, and the broadhead was destroyed, but the leg was so demolished it nearly was amputated. I don't think that would have occurred without the reinforced collar/insert. I will say this about the collars, they can't hurt and they do add some extra durability to the arrow. But they don't make them indestructible. The arrow can still break and crack, but I've had enough hard impacts and arrows still be shootable to continue running them going forward. I now use the same arrow but with a 10gr IW titanium collar.