Personally I have never been left wanting more from my Redding or RCBS seater dies crimp. Where needed, a good firm roll crimp provided consistent bullet pull, good powder burn and firm bullet retention where needed. But the crimp is just part of good bullet retention. Properly set up dies and properly sized expander ball are also important parts many never look at or even think of.
IMHO, the Lee Factory Crimp Die is a cure to a non existant problem. As a matter of fact in some cases and if improperly applied, creates problems. many like it mostly because they have been taken in by the hype or don't know the difference. Seeing factory Winchester loadings in the past, with a similar looking crimp, did not help any...
What are you having problems with or what do you looking to accomplish?
CW