I just finished testing the SR300. I tested it on a 37ft. heavily crowned pattern with medium/heavy oil. I also brought a Big One and a One to see the difference. The SR300 is cleaner through the heads and midlane than the Big One and much stronger on the back end. No surprise since it is losing less energy going down the lane. It is a tad earlier than the One but it is more angular off the dry. Could be the surface prep. The way I see it it fits nicely in between The One and The Big One. I'll post more if I see anything different the next couple of times I use it.