Hello. I recently bought a pair of the Federer Vapor Tour's from Wimbledon a couple years ago. My issue is that I realized after buying them, they have soles made for a grass court. Will there be much of a difference in terms of feel on hard courts? I really only play outdoors at local parks, so I never play on grass or clay. Moreover, and maybe more importantly... will they be less durable on hard courts? Does the sole wear noticeably faster? Any input would be greatly appreciated. Thanks!