The BP starter is meant to be used on hulls that have NEVER been crimped before. It is a crimp CREATOR, not a crimp STARTER.
I suppose if you took your time and aligned the folds on the hull correctly it would turn out OK (probably no better than the spindex starter), but they DO NOT auto-align, so unless you align ever hull by hand, they will absolutely mangle 95% of the hulls you load.
I use the super crown on all new, never before crimped hulls. For once fired and beyond I use the MEC smooth cone crimp starter. It will start either 6 or 8 fold crimps so you don't have to sort the hulls by crimp.
The super crown starter makes new hulls look like factory crimps!