I wouldn't place 100% of the blame on the ball for it getting so dirty.  It appears those A2's need to be cleaned a little those ball lift marks are a sign of lack of cleanliness.

Just saying....

This thread re-affirms how important it is to clean equipment after every set..

Ball does look good though, I may have to look at one..

Lefty,

Its actually a Bank Roll with a finer finish and a slightly weaker cover (76 vs 74 on the mamba)  Bank Roll was finished at an E pad, and the Mamba is at a T pad. Numbers look the same, otherwise.

I think that the Green Mamba, Freight Train, Look, Cobra, and Bull Whip are finding their way into my bag.

Lefty,

My pleasure. Its my belief that 900/AMF is making the best stuff out there. I'm trying to figure out what I am going to retire to make room for the new pieces. Sure thing will replace my Clutch, Look will replace the s75, Bull Whip may replace my Clutch Pearl or big heist, and the Cobra... it doesnt have to replace anything, does it?

Well, this second edition in the mamba far exceeds the first, not only in eye appeal but in performance too.  I used a simple pin down drilling (similar to my break-out that I use at USBC’S), the result was a very clean and predictable roll with the ball reading the front/middle part of the lane and then still retaining energy to go through the pins.  What I really like about this ball is that I can play surprisingly far in with it and the ball is very versatile, which is a great selling point for pro shop operators.  The ball is super clean through the front part of the lane, thus more back end reaction and better pin carry.  This would certainly be a great ball for a bowler who is looking for a high performance ball that he/she can use on a variety of patterns and surfaces.