What I've found (and I realize I've probably loaded far less rounds than many on the forum) is that the 'pistol' type ones they sell are still case-length-sensitive, despite their advertisements, and that they are difficult to adjust to a 'firm-but-gentle' crimp (I'll admit, they will crimp pretty much
any bullet, even where the cannelure
isn't, if desired).
On the other hand, the 'rifle' type I've found very easy to adjust to 'just right', never over-crimping or damaging cases.
Ironically, while I do trim my bottleneck rifle brass (so a 'regular' crimping die that is 'length-sensitive' wouldn't be a problem for
those cases), I don't generally trim my straight pistol brass, so it's nice to get a uniform crimp even on odd-lots of cases.
I first tried the FCD in .32-20 (Lee considers the .32-20 a "rifle" round for FCD purposes), where I had lots of brands and lengths and thicknesses of brass, but since I wasn't going for 'target' loads, I didn't segregate or trim that brass either. One of the things I feared was that the 'rifle' type crimp would wear out the fragile .32-20 case mouths faster than the roll-crimper I'd been using, but that didn't appear to be the case. I didn't bother looking for a taper-crimper, since the brass was of several brands and varied in thickness. So far, I've continued to be pleased with the .32-20 FCD, though I don't shoot a high volume of that round.
A couple years back, I wanted to see if I'd like the 'rifle' type FCD for .44 Mag, instead of the normal RCBS one I'd been using, and to do it, I had to hand-file a few thousandths off the bottom of a .44-40 Lee FCD ('rifle' type, vs. the .44 Mag 'pistol' type they offer). I found (again this is just 'me') that I got more uniform crimps, which seemed to help the accuracy I was getting from the 2400 (19 grains for a 240 JSP or therabouts). I loaded around 1,000 rounds or so with that die, and grew to appreciate the consistency and so on, so I guess I'm hooked now...
I think that most of us who reload get used to what we start with (brand-wise), and learn it's quirks and how to use it to best advantage, and since pretty much all of the name-brand stuff out there is decent, we turn out good-quality reloads with it in pretty short order. Then, unless some new competing product really has a definite edge, we tend to stick with what we have confidence/experience in, and most of the time there's little or no reason to change. For that reason, I'm not really trying to persuade anyone they NEED the FCD's for those cartridges, but in case anyone here WANTS them, I thought I'd let it be known that RanchDog has now got them in stock.
When I get them and get to using them, I'll try to do some semblance of a "range report" if I get time. Even then, "
your mileage may vary..."