the combo is nothing new among this board, but i have to throw my experience out here. I'm playing a tournament at my school right now, so i splurged and bought a pack of gut. I used Babolat VS gut 17g strung at #63 in the mains, and Gosen OG Micro 17g strung at #62 in the crosses in my Wilson hyper prostaff 5.0 The 5.0 is a fairly stiff frame, but this string hybrid made it the most perfect racquet i've ever hit. Plenty of power to crush the groundstrokes and first serves, and the feeling i got on impact was just amazing. an all Gosen job is very nice too, but throwing some VS gut into it is heavenly.