[I would have to agree with KMRUNOUT as per the comment on the green logo Aramith magnetic ball. I do agree that it was the best option out there until the new Valley Cougar Cue Ball came out in late 2010.
The green logo Aramith ball and the Valley Cougar Cue Ball plays different. Like previousely said in other statement, the green log aramith ball draws and follows through differently than most and the Valley Cougar Cue Ball plays more like a red dot.
It is harder to drive the Valley Cougar Cue Ball through an object ball like you can with a green logo aramith. You can draw it the length of the table pretty easily without having the cue slide fwd after contacting the object ball like with a green logo. Its seems to me that the Cougar ball deflects differently when looking at how it comes off an object ball with a half ball hit for instance, seems the green logo goes straighter than the Valley Cougar Cue Ball on a half ball hits.
Since I have played with one and compared it with others, I would recommend Buying a Valley Cougar Cue Ball.
Sorry for using the proper name for that cue ball so much, but both balls do have the green aramith insignia on them and I just didnt want any confusion. The Valley Cougar has a big green Cougar on it also.
Oh, as per the weights, weighed three green insignia balls and they all weighed more that the Valley Cougar Cue Ball.