I play mainly doubles and am playing the old 88s with 25/27 BG65, which was the only string I had. I would go for the 66u with 24/26lbs. I'm happy the racket, however I feel like it's lacking a bit of power. It's partially due to the softness of the string and also me not having the pure power for big smashes. I'm considering getting the 88dpro, which is about 30-50€ pricier than the new 88s. I've read many reviews of the 88dpro and all of them are fairly positive. Opinions/suggestions would be appreciated. Thanks a lot!