Micron uses JGS resize reamers to cut their dies. I use a 300 PRC SAAMI JGS chamber reamer, I am a big fan of JGS work and products. The Micron die would probably work for me but, keep in mind, sizing dies have to match the chamber. If the chamber was cut with a reamer from a different company or with a non-SAAMI JGS reamer or a worn-out reamer, then the Micron die may not match up.
I use a Wilson sizing die for 300 PRC, I paid about $100 for it. My sized brass fits my chamber. I am using Lapua brass and it has been fired 7 times - primer pockets tight, I get very little case stretch, clean extraction. I see no need to spend three times the money for a Micron die. Your budget may allow that, mine does not. The Micron die may be the most expensive but is it three times better? No way. At a SWAG, no more than 5 percent better.