I have a Cervelo R3-SL with standard Easton wheels.

The bike is great and fast but I see people upgrading to Zipp 404 was wonder if it worth it?
I was also looking at Zipp 303 Tubular, they seem real nice.

My back-ground is that I am 50 something guy (195 pounds) that rides on group rides and by myself but not into racing. I do a few Century rides and was thinking that the lighter wheels would help but a I question the wisdom of Tubular for repair. My general feeling is that is should just stick with what I have but the Zipps look nice and faster is better?