I'm sure down the line with some use, I'll replace the polymer guide rod, but for now, it seems to be A-OK. If you're thinking about buying it before you have (or have used) your P99, give the polymer one a chance and see how it works for ya.
I have put about 200 rounds down the pipe so far and everything about the P99c is above expectations. I just thought the guide rod looked flimsy and just wanted to know what the experts think. Ha. Anyway it's fine like it is as long as it's reliable. This sure is a fun gun to shoot. I may start carrying it soon. It's the first non 1911 I've ever owned and I love it.
I hope I didn't imply that it was unreliable. As Stunks notes, it sees almost no stress while in use. Just during field striping does it see some bending. Mine didn't fare that well at that point. That, and it just seemed cheap to me.