I'm not a fan of the voice acting. I know everybody has their own headcanon of what the characters sound like, but Kid sounds too old and Harle's accent is so ridiculously over-the-top that she's almost impossible to understand. Oddly enough, Serge sounds okay.
If there is indeed going to be a Chrono Cross revival and it has voice acting, I hope they get a different actress for Kid and also have her portray Harle, but tone down the accent a couple dozen notches.