I hit a little bit of everything on the serve, some slice and some flat stuff. It took me a couple of weeks to get used to the N-Codes on the serve. I've had to take a little off the first serve, but all in all, I haven't had to change much from the Pro Staff and I feel like I'm serving as well as I ever have. Most of my serve problems arise from mechanics rather than rackets anyway. I've been able to serve ok with just about any racket as long as I concentrate on the mechanics (consistent toss, watch the ball, knee bend, etc). My best advice is to not over-analyze it or radically change your service motion, just hit it like you always do and make a few minor adjustments if needed, once you play with the racket a little longer. Good luck!