Remember Morich???.....They had some of the highest int diff bowling balls at the time at .027 up to .037 undrilled pretty consistently across their brand.

Other brands at that time were also using with higher int diffs.....then they stopped. Notice brands then went to int diff in their high performance lines of .010 to .025 max.

Now you have Hammer with symmetric cores in their HP line and Columbia with the Swerve series using .007 which is considered symmetric even though they mark the psa on the ball.

Many manufactures quickly figured out symmetric and lower int diff asymmetrics were more driller and bowler friendly.

I remember buying a Lane 1 Cobalt Bomb several years ago.  They fooled me like thousands of others.  As a licensed Professional Engineer, I should have my head examined.  I bought into the whole diamond core marketing and thought "wow, this all makes sense... this diamond core is the answer I've been looking for!" I tried that ball on various patterns and there was nothing special.  In fact, I noticed I left a lot of 10 pins with the ball and it did not "shatter" the pins like advertised.  I sold that POS a few months later.  First and last time I buy into a company like that.  I stick with the majors now and balls thrown by "WINNING" pros on TV - Storm and Brunswick. 

I remember buying a Lane 1 Cobalt Bomb several years ago.  They fooled me like thousands of others.  As a licensed Professional Engineer, I should have my head examined.  I bought into the whole diamond core marketing and thought "wow, this all makes sense... this diamond core is the answer I've been looking for!" I tried that ball on various patterns and there was nothing special.  In fact, I noticed I left a lot of 10 pins with the ball and it did not "shatter" the pins like advertised.  I sold that POS a few months later.  First and last time I buy into a company like that.  I stick with the majors now and balls thrown by "WINNING" pros on TV - Storm and Brunswick.

I really liked some of the Lane 1 stuff back in the days when they were poured by Brunswick. I never truly thought that the diamond core was magical or anything, but most of those balls rolled really well for me, and the carry was quite good. Once Brunswick stopped pouring for them, there weren't nearly as many releases that looked as good to me, so I stopped using them.

In the end, it was always the same debate. Some people matched up really well with their gear, so they felt it was okay to pay the higher prices. Others didn't match up as well and/or didn't see enough benefit to warrant paying the extra, so they didn't. It led to countless shouting-match threads that really went nowhere. In the end, it always comes down to the same thing. It's up to the individual bowler to determine what works for his or her game and how much $$ is worth spending to get it.