I must say I love my s55's that I ended up buying, but they left me wondering one thing:
Why does PING even bother producing the i25's when the s55's have just as much forgiveness, look prettier, and (for me) hit the ball longer with a tighter dispersion? Honestly these things are much more forgiving than my old Eye 2's, and they still feel just as forgiving as the i25's. Not to mention center contact feels better and they are just an awesome looking club overall.
My one complaint with them would be the stock shaft option. It's definitely very bendy for what is labeled as a stiff flex, but I'm replacing them with the KBS Tours so it's a non-issue for me. I just wish they'd carry the KBS Tour shafts in the clubs at some golf shops, instead of only the stock options.