if you get the ones rated to a higher speed, then they're OK, but AFAIK they use the samsung UCCC chips which aren't overall the greatest thing since sliced bread, and they like loose timings
if you have cash to bust, and want the best, pick up a set of the 2x1gb Crucial PC-4000, this uses the micron chips that no one else has, and it seems to be the best 2gb DDR kit out there so far