The TS3 is a progressive cavity design and has a little wider sole than the TS1. The sole of the TS3 also has more front to back radius. Bounce is the same through the 7 (3 deg.), with the 8, 9 having 4 deg. and the P, G having 5 deg. The profile of the TS3 is a little different. Heel height is a little lower and toe height is a little higher than the MMB-17. Heel height a little lower than the TS1 as well, but toe heights similar. TS3 has a thicker topline than the TS1 for sure, and a little thicker than the MMB-17. I still call the TS3 a players cavity design, but it does have a different look than the TS1 or the MMB-17. Playability is in the high 700’s (786) vs. the 711 to 714 on the TS1 and MMB-17 respectively. That is not much and all three fall into the Super Game Improvement category, but the TS3 should be slightly more forgiving. Testing n the TS3 has been great. the TS1 continues to be a best seller with great reviews and support. It mostly comes down to the look and the slight difference in playability. To me they both look great at address. A little different from each other, but both great (in my biased opinion). You may just have to order one of each 7 iron head for instance, and compare, once we have the TS3’s. Once you decide you can send the other back. We do not have a firm date on the TS3 yet, but it is in production. The good thing is I do not believe you can make a bad decision on this one.