I had great results with a 125 gr NAP Spitfire last fall, but perhaps would have with any broadhead. Had Muzzy 125's on my "prime" arrows, but was a windy day (15-20) so switched to "backup arrow" fitted with Spitfire specifically because it should be less affected by wind. Muzzy's were true in still air and light wind, hadn't shot them in heavy wind. Shot was at relatively short range, between 10 and 15 yards at an 8-point that came right up under my stand to my grunt call before turning to walk away. Downward shot from behind went through liver, both lungs and clipped heart before lodging in upper leg bone on opposite side. No blood trail since heavy bone prevented pass-through and couldn't bleed from high entry until body cavity would be full, but the buck ran about 40 yards, stopped and wobbled, then fell over within sight. Thoroughly bled out, but internal. Broadhead was intact, carbon arrow broken off about 4" above broadhead at interface between body and leg because of running. Bow at 67 lb, 30" draw, #300 Camo Hunter.
Great results, but no way to know if the Muzzy would have done better. Sort of wonder about the sharp tip of the Spitfire on bone vs the chisel tip of the Muzzy and Rocket Steelheads. I'm carrying Steelheads instead of the Spitfires next year for that reason, tend to think they'll punch through bone rather than into bone the way the sharp tip could. Certainly wouldn't hesitate to use the Spitfires again, though.