Alright.  I'm looking into drilling my next ball (yeah, whenever that'll be...) without actual grips.  I'm going to keep my thumb slug, though.  It's going to be a bit of an experiment, as I haven't had a ball w/o rubber finger grips, but the opinions fly both ways.  Why do or why don't you like grips in your bowling ball?
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I'll give you five bucks off 'cause you look like a guy who knows his BALLS!

i feel the ball get cleaner off my hand without grips.  it took awhile to get used to but i really like the feel now

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Go Balls Deep

Lefty

Team Banger
www.bangerbowling.com

The feel ball to ball is more consistent, the release is cleaner, and most importantly for a ball-whore like me, its cheaper to go no grips. I am glad I made the switch and haven't looked back.
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Bowling up a storm with a punishing hammer.

Two major advantages without grips.  1.  Cost  2.  Your span is always the same.  I've replaced grips for customers that had let them wear so badly that their span had been reduced almost 1/4".  --  JohnP

It's all a matter of feel.  There really isn't a right or wrong answer.

I used to use straight holes exclusively but now all my new stuff has inserts. I found that it's easier to punch out because I don't have to ask the driller to bevel here or there on the finger holes.  The feel is almost the same across balls and for some the burn on the fingers is minimized as well.  I used to really burn on the fingertips but now it's much better.  

So for the OP what do you like?