DP you're kidding right!
Down home a buddy of mine had two 300s with his. Also a bunch of 780 and 790s.
He loves it as do others. Big backend if lighter oil they ALL said.
Of similar design the Tornadoes from Ebonite had some big backends, as do the
Dynamic Grooves from Brunswick. I've been very impressed with this class of ball on dryer lanes(pancake with Puck).
REgards,
Luckylefty
THe only ones who I haven't seen love are high rev high speed bowlers who throw these things right thru the breakpoint a lot!