I've shot open for less than a year and am only a B-Class shooter, so take this with a grain of salt, but here is my experience.
I am a diehard fanboy, so when I decided to switch from limited to open, the czechmate was the obvious step. Initial benefits were that you can buy one immediately with no wait and it comes with magazines.
Despite what people say, it's still in your best interest to get the messages tuned by Grams. So you might as well also buy CZC basepad and have the Grams followers installed at the same time. Once that was done and I developed a load,