A lot of good advice but also some misguided advice too, the BPI roll crimp tool is just that ~ a roll crimp tool, it may also work as a finishing tool on six or eight pedal crimps but if you read their advertisement as referenced here following and above: http://www.ballisticproducts.com/Hull-V
... info/VISE/ , you will read that the BPI roll crimp tool is a ROLL CRIMP TOOL and not the next level "FINISHING"
tool that the GAEP BN series is, in fact GAEP BN's have four levels of finish crimping. GAEP call their ROLL crimp tool an OTR
or at least that is what is inscribed on the tools that I have.
I use 4 MEC Supersizers, 28, 20, 12 and 10, for my different gauge hulls and change the Supersizer by unscrewing 3 wing nuts and replacing that gauge Supersizer with a different one and then tighten 3 wing nuts the change over is accomplished quite quickly, as well as changing the GAEP head from an RTO to/from BN series, its quite quick actually and I do it quite often as I am not loading near the volumes as some of you guys and I like to experiment.
My Sizemaster Presses look after the initial sizing-decapping and the Supersizers are only used for GAEP crimping except for the 28 ga Mec 600 which as a separate operation I screw the Supersizer to the bench or just swing the Drill Press head to the side sometimes and size them with the Supersizer still mounted on the Drill Press. Gaep is then used as Jeff and others have described, I find this method easy and very quick as my left hand only leaves the Supersizer handle to insert or remove the hull and my right hand never leaves the hand crank on the press. Expensive? maybe, but over 50 years it has been amortized to a very low cost along with a bunch of other reloading and gunsmithing related tooling and test equiment.
Larry's comments should convince most TARGET shooters that where money is involved, and IMHO game too, the more CONSISTENT you can make your ammo the better your chances are. I have never seen a comparison of GAEP vs anything else ~ finish crimped patterns or velocity, but my money is on the GAEP having a lot better Standard Deviation.