I have one that I use.I don't crimp much of anything very much except 44 mags with 296 or H110.I only crimp enough to remove the flare from the case at the case mouth so that the cartridge will chamber in the tight necked chamber. With a .379 groove diameter and .381 bullets,after using the .379 expander that comes with the RCBS Cowboy dies there isn't much chance of the bullets being pushed back in the case in the magazine.Others results may vary.
The RCBS roll crimp is the best way to go. I pitched my LFCD because it distorted my cast bullets. My 38-55's are quite finicky about bullets and the distorted LF crimp is just one more step in the process in addition to being detrimental to accuracy. LFCD work very well with jacketed bullets but not well with any cast bullet. It is extra work, is not needed, and harmful to accuracy. So, to me it was worthless for my uses. YMMV