For me the vacu grips have been great.  I sometimes have problems with my fingers swelling.  With the traditional grips, it sometimes meant I couldn't use the ball because I couldn't get my fingers in it.  The other option was to go with a larger size and sacrifice a good fit when the fingers were not swollen, most of the time.  I've hed the vacu grips in since last July and haven't had to put a ball away due to the fingers not fitting.

I won't use anything but vacu grips any more.
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"I cannot change the direction of the wind but I can adjust my sails to reach my destination." Jimmy Dean
http://www.allbowling.com/journal/public.php?uid=156&leagueid=53