I purchased a Giant TCR with stock Xero Lite XSR3 wheel set a couple of years ago. I have no clue whether or not an upgrade is in order, though I hear that is one of the best bangs for the buck (next to training more/better). I do not hear a lot about these wheels-good or bad. I have not started racing yet, weigh 165 lbs, but mostly club ride with a lot of local "racers' and hang alright with the fast group occasionally getting dropped (not often). I am not ready to throw down $2,000 on a set of wheels, but would like to get faster if I can do it without dropping too much. Are the Xero's good, should I consider the Neuvations or others?