I'd like to chime in on the NST, i have been throwing them for a few months now. I have recently shot 300 in back to back weeks on the USBC white pattern, using 2 different NST's. I have found them to be versatile, and very reliable pieces. I have 1 drilled pin up, and it give me a strong back end reaction, allowing me to loop the lanes when needed. I have a pin down, when the first one is too jumpy. What I have come to see, is a ball that has been over looked due to the fact they are a small company, which is a shame because they have some quality pieces out there.
If you have any questions concerning these balls, please contact me.