I'm a little late to this post. But the RCBS presses have a very good, long & solid reputation. And the kits are a good way to get stuff many will need to get started. When I started handloading in the 1970's,, single stage presses were the normal presses everybody had & used. Progressives weren't really in the market.
But,, A progressive can & will make handloading a lot quicker & easier if you need or want a larger volume of ammo, in a very reasonable timeframe. That said,,, Dillon is THE name to go with there. Many use others, but when I got into USPSA in the 1990's,, and they would survey the shooters at the Nationals,, by a large & solid margin, Dillon was the choice of all competitors,, and especially the world class shooters. In the last few years,, they started back doing survey's of the Nationals & competitors equipment again. And again, by a LARGE margin, Dillon is still THE machine to choose. The only changes I noticed,, was the choice of models. Many folks have stepped up to the bigger machines (750 & 1050, 1100) vs the earlier popular progressive chosen,, the 550.
My point in all this,, is you've already ordered a kit. Excellent. But if you decide you need to "kick it up a notch or two" then look hard at Dillon. I know folks who have a few RCBS single stage presses on their bench, AND a pair of Dillons. The common theme is; "It's easier to have one machine set for small primers & the other one for large primers" making caliber swaps very easy & quick.