I have thrown the Track Kinetic Ruby, Track's newest MP bowling ball. I have used it on a few THS and 2 patterns. After loving the Kinetic Emerald, having the Ruby was a must. To compare, the Ruby starts up a little earlier, and is a tad less responsive down the lane. They are both drilled pin up, CG slightly left, factory surfaces (I am a lefty). This makes them the perfect duo in your bag, especially for the price point. If you want quality for the dollar, look no further, this is where you should be...