I've been a big fan of balls with diffs of .3X for a long time.  They usually take out a lot of the midlane as often their rg is in the 2.56 or 2.58 range.

A few examples of these balls are my beloved and departed Icon 2 from Columbia, The Track Heat series balls(with a core that looks a lot like the core on the Heat Stroke).  The Noize series from Columbia, and the Twisted Fury's from Brunswick.  Oh another one I love is the Storm Hot Wire(it's nephew out now the Roto Grip Rumble).

This ball with a core like the Track Heat series however has a much lower rg(meaning different densities than the Storm version of the core) and the ball in videos looks like it has a good amount of midlane and then a lot of smooth predictable rounded power at the back. 

Video here
http://www.youtube.com/watch?v=IXMvVOzyHuw

I just wonder about the push on lighter conditions due to the low rg of 2.49??  Anyone have an opinion?

Looks like a great ball, and a great 1 , 2 combination with the Solar Flare on a lot of mediums.

REgards,

Luckylefty

Heat Stroke is money!! Finally got my equipment and knowing I was going to be bowling a tournament on a broken down shot, I drilled this one first. I went 80*x5"x42*, exact layout as my Hook Pearl. Where the Hook Pearl offers length and pop on the backend, the Heat Stroke has similar length with a very smooth, predictable, and controlled backend motion. It clears the heads with ease, but doesn't jump hard on the backend. Depending on the volume of oil, this ball could easily be a benchmark ball. Quite honestly, I am surprised that it is a pearl. Reaction is very similar to the Cobra SE. Furthermore, how the ball goes through the pin deck and carries is phenomenal for a ball at this price point. AMF has hit a homerun with the Heat Stroke; don't be afraid to pick this one up.