the last lane 1 ball i got was the grind/r it was as hard hitting ball as there was a great ball for medium to medium heavy and guys with alot of hand could use it on heavy oil,it seems as if the typhoon was a remake of the dynamo core,which had mixed results the pro v seems to be some kind of boomerang core remake,there are video reviews on bowlingball exchange so you can see for yourself they are very helpful