Here's the problem, during the time that those balls were coming out from AMF and were popular, was a period when I took a hiatus from bowling. It was cuased by the owner of the center I used to work for being a butthead (he eventually lost the center to bankruptcy) as well as having major elbow problems. So I took a few years off. Upon returning, I used the gear I could get my hands on, before investing in a lot of the new stuff until I was sure my elbow and psyche could once again deal with bowling. Now that I'm all the way back, including running a pro shop for the small Air Force Base lanes, I'm completely back to AMF!
Now, WHY AMF? Well, I've always bowled well with AMF gear, and LOYALTY is a major "flaw" of mine - see, I'm a retired Marine! And I don't want to join a ball-of-the-week club, and don't want to spend thousands on trying out every ball every maker comes out with. So I'll stick to AMF. I am also the only one in this city rolling exclusively AMF! (which I'm trying to change, little by little)
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Semper Fi! AMForce Rocks!