I use RCBS dies because of the experiences I have had with warranty issues from other companies, as well as the fair pricing. (Redding, I do consider a step up from RCBS, but you pay for it.)
My reloading bench is multi-colored. When it comes to all-around reloading tools, I use what I have found to be the best (or I prefer it) over other similar products. Hornady, Dillon, Redding, Lyman, RCBS... they all have their strong points, and usually quite a few of them. But, experience teaches you what works best for you, and what brand might fail more often. (Or, what brand might take the longest to get you a replacement part.... if they get you a replacement part.)
I like the Redding Boss(?) single stage press, but own a Rock Chucker IV. The RCBS was cheaper, and came with better accessories. They're both stronger than most people will ever need, and will last longer than I. Price won that battle. Hornady was a runner up, but the accessories sucked.
Lee.... well.... I have had too many bad experiences with Lee. Dies that weren't finish reamed, dies that had oil dried to into an impenetrable varnish, shell holders with tolerances so rediculously loose that shells can slide so far to one side they fall over, a scale that was off by +7%... the list goes on. Sure, they were under warranty, but why should I believe they will send me a quality product if the first one made it through quality control in such deplorable shape?
You get what you pay for, and I'm happy being a middle-of-the-road guy.