Just bought my third pair of Res 2s, and the other two are still fine after about a year of alternating them on hard courts. I kept my Res 1s and now use them on clay, with pretty good results.
I sometimes notice the funny sound, but I can live with it for the comfort and stability these fine shoes provide.
P.S. I bought my second pair of blues and am looking hard at the new black Res 2. With all black Nike or Lotto shirts, shorts, socks, wrist and head bands, I could be Darth Hacker. LOL