In the current issue of Tennis magazine, these racquets were listed as classics. POG PS 6.0 Prestige...oh yeah. and PD (I didn't like it but I admit it has been very successful and influential) and then Yonex R-7? Navratilova used it but I never heard of the stick or seen anyone using it. I knew RD-7 or R-22/23 but was R-7 that successful or popular like the other three? Also I am curious about yonex racquet history (not b/c I am a fan but b/c it's less known than Prince, Wilson, Head etc). Thanks for reading.