I've been using dex-cool along with full synthetic oil not only in my bikes but also my autos for many years with no advers effects. However, i'm rather anal wiith frequent fluid changes which probably has more to do with results than the choice of fluid. But I'm not likely to change just to find out differently.
I keep 'em clean and waxed, lubbed, adjusted with fresh fluides and it seems to do the trick for me.