I bought the breech because it seems every field I've played at this year is carrying Diablo Blaze, and I have yet to use an insert larger than .684 on my PowerLyte kit. I use a HALO B, and with smaller paint on my stock breech I got lots of double, and sometime triple feeds. I haven't had a problem yet with this new breech - looks very cool - Tony from New Designz hooked me up with purple ball detents so the breech looks trick on my purple acid washed trix.
Conclusion:
If you're having problems with double-feeding, or just want to personalize your trix, buy this product, its worth the dough