Got mine last week, and this ball has taken me a  little to get used to.  I usually throw down 10, and I'm not a real across lane bowler.  Last night in league, I stood left and threw it out o 8 and man that thing moves.  I've never been able to throw a ball out and get it to come back.  EVER.  This ball hooks and comes back like a tank.  On top of that I was throwing first game on fresh oil. That is amazing!  I originally started out trying to throw this ball my usual way, but it kept going brooklyn, even if i tried to chuck it in the oil to hold.  Once it hit the spot-goodbye!!  I will say though, this ball seems to push oil down lane instead of dry it up.  It's almost  like urethane.  May sound crazy, but this definitely looks like it happens.  Either way, the more I throw this ball, the more I'm getting used it and liking it.  You'll have to move inside for sure though. 

In league last night, I finally felt like I got a good feel for this ball. I'm a bit speed dominant, so I wanted a ball to handle the lane and my speed.   This ball just hit like a tank all night.  Game one I shot a split and chicken winged it a couple times, but came out with a 216.  I made a ball change halfway through game 2 and regretted it. I switched to my black widow LE and it actually hooked more than the Grudge. I think I put more hand it in and paid the price.  So I went back to Grudge for game 3 and moved my feet, and wow what a game.  Shot a 268.  Would have been a 300 if it weren't for 2 stone 9 pins.  Great ball.  Great look.  Lots of hook.  Just what I needed. BTW, my Thug Life complements this ball wonderfully.  Two great balls to take care of most patterns for me. 

The Grudge is a very strong piece, so it's really stood out for me on longer and/or heavier tournament patterns; however, unlike some of the others, I've been able to get some usage out of it in league as well. Although our league pattern is far from heavy, I was able to use the Grudge with a lot of success provided I kept it in the oil to keep it from burning up. Unlike many other high-end balls, the Grudge doesn't burn up at 10 feet; it retains energy fairly well, especially for a ball that strong. Brass tacks, if you need a strong ball for medium-heavy to heavy conditions, the Grudge is a VERY good choice.