Just strung up one RF 97 340 gram and one RF97 315 gram with Luxilon Savage in 51 lbs each. The weight was 337 and 313 grams. 340 has leathergrip and 315 has synthetic grip (Here it´s easy to replace the synt. grip with leather and add about 10 grams weight making it 325 grams) At first the 340 unstrung felt very heavy but when strung and overgrip on, it felt just perfect. 315 felt "whippy" and fast. I have not played them yet. Will take them out on court tomorrow. I just tried some volleys against a wall, and they are both ROCK SOLID. The 340 feels 100% pro-stock but what surpsised me was the solid feel of the 315 as well. It will be extremely interestring to try them tomorrow evening here in Sweden (about 2 pm NYC time). Will post the initial feeling of them tomorrow. Here are some photos.