I had one and it did not do much for me so I inquired on the DynoThane forum as to what serial numbers were effected. Someone contacted me from DT and asked for my s/n. After I supplied the info, they sent me a new ball. DT never came out with a list of the 'bad' balls, they just requested your s/n and if it was one of the 'bad' ones, they replaced it. With DT no longer in business, not sure how you can find out if yours is good or not.
I dug through my info and this was my s/n:
05DNGA13M519
Mine was dull and from what I remember, the 'bad' ones were dull, the good ones were shiny, OOB. Apparently, one or two batches came out as just a urethane ball, no resin. Now, I wish I still had that urethane Energy because I could use it for some of the patterns I am seeing. I ended up giving it to a high-rev bowler after I got the replacement.
_________________________________________
Need bowling information? - Please check this:
BR FAQ