The only straight wall pistol cases I trim are the 38/357's and 44Mags. For the Mag calibers I use a pretty heavy roll crimp. Everything works fine until you hit that case that's on the upper end in length and you mess up a case. I've found that by trimming all once fired brass in these calibers you get a very consistent crimp without damaging cases. Besides, this is a hobby for me and gives me something to do in the evenings so time is not an issue. If you're loading them moderate or less with very little roll crimp it probably won't make any difference. I also load 223/5.56 so I've already got the trimmer for those.

With that in mind, I've never trimmed 380, 9mm, 40S&W, or 45ACP and have had no problems with any of those.