I have used RCBS dies exclusively for a lot of years and never had any problems.
For straight wall pistol calibers or .30 USM1 Carbine, be sure to spend the extra dollars for carbide dies.
When loading lead bullets, be sure to take the seating die apart and clean out the accumulated lube and gook every once in a while.
For each caliber you load with different bullets, it isn't a bad idea to make a dummy round (bullet seated to proper OAL, with crimp if appropriate, in an unprimed and uncharged case). This simplifies adjusting the seater plug when changing bullets (or plugs).
In addition to "standard" calibers, RCBS makes dies for a long list of wildcats and obsolete cartridge, as well as case forming dies. Some of these have to be ordered from Huntington's. (Fred Huntington was the founder of RCBS until it was sold some years ago.)
I'd urge you also to acquire an RCBS stuck case kit. It is inevitable that one of these days you'll ram an unlubed or inadequately lubed case into a sizer; having this kit on the shelf means that your downtime will be measured in minutes rather than days.
If you are going to reload military brass with crimped primers, get an RCBS primer pocket swaging kit. This is not only much easier to use than reamer-type products, it also makes for more uniform pockets.
