Is there really a big difference in a 100 head size and a 107 head size? For example, the new Yonex RQS 11 has very similar specs to the discontinued Vcon 17 OS. The main difference is the RQS 11 is a 100 head size and the Vcon 17 OS was 107. The beam width, swingweight, and weight are pretty similar in both rackets. I never played with the Vcon 17 MP, but I hear it played almost identical to the Vcon 17 OS. The MP supposedly was less powerful, I guess because the head size was smaller and it was slightly head light.