Already have. These aren't my first Midwest cats, in fact the pair I've been running the last two years were from Midwest. I also haven't noticed any difference in real-world performance.
I'm not sitting atop my chimney with a particle detector, maybe that's where the difference counts, and that might matter to some people in other regions more than me. As long as I can turn the stove down to my required burn rate without stalling the thing or gunking up my chimney, that's honestly all that matters to me.
I do believe my current pair failed due to leaky door gaskets, or because I've grown a little to lax with my operating procedures, not because they were made by Midwest. The failures were purely mechanical, distortion of the can and cracking of the ceramic, likekly due to overheating.
Again, if anyone has a reasonable gasket alternative, I'm all ears. Looking for some place I can point my mouse and click "buy now", with a shipping fee under $100 for ground service.

No complaints on the BK gasket quality, it's actually impressive how long it performed its task, I'm just not loving the idea of sending any business to the local dealer.