To be honest, since the giraud trims and chamfers (inside/outside), you do not really need anything else. When you change out the lock rings that come with it and use the clamp type, all your doing is changing the shell holder out and never need adjusting. This is the one trimmer that sells itself. Everyone loves them. It takes longer to pick up a case and put it back in the tray than it does to trim/chamfer a case. It cuts your time by half at least.
I use the RCBS very seldom actually. I also have a wilson trimmer from when I was converting 308 lapua to creed that I never use. But I keep it around so I can ream necks if need be. I ordered a 6.5 saum shell holder, but have yet to use it since my cases are not growing...so I end up just chamfering with a hand tool with only 100 cases. Like many, I bought it to chamfer etc, now it collects dust.
I think I have 6 shell holders and 4 cutter heads + the price of the trimmer....so yeah...its a big investment. But there are 2 tools that I love and will never give up for many years...the giraud trimmer and the 21st cent neck turner.
To make it more palatable, when ordering one...it ususally takes about 60 days to receive it. With a high volume of cases it is highly recommended, but if you only have 100 cases anything can work well. If more guys chime in, while they may have the Lyman or RCBS station....well they use thier giraud now.
Buy once, cry once.......