E-Mag Micro w/ full freak kit, 68/45 w/ drop, haloB
-changing bores doesn't take very long
-accuracy (although multiple boomsticks would probably beat this)
-price...consider that buying several high quality barrels would cost more than this for sure
-can change the overall length if you have more tips
-fragile aluminum inserts (steel now available, but more expensive)
Overall, I've been quite satisfied with my freak kit.