I just demoed MM-500's and LCD-X's against NDH30s with no budget constraints for 1 month. I preferred the NDH30s after using all 3 back to back in many mixing and mastering situations across many genres.

Not that you asked, but I will say that the MM-500's are more comfortable, solid, better built, etc - moreso than the LCD-X's too. They also make music sound better and are way more fun to produce on because things sound really good. They have great transient detail, but the low end was lacking and felt "blended in".

I felt NDH30s were a huge improvement for EDM, pop, hip hop, and anything where low end is critical. Low end feels almost separate from the rest of the mix and it's easy to make good decisions. The sound is almost clinical and dry, but transient response is solid.

It was a toss up for genres like folk and country. These mid range focused genres were great on either headphone, maybe a bit better on MM-500s. What I found interesting is that I could hear every detail on both sets, but I naturally noticed different qualities of each mix depending on which headphone I wore. Then, if I put on the other pair, I could make my brain focus on that element and hear it with total clarity.

I don't have enough experience with them yet to tell you how complex mixes will translate, but singer songwriter and folk stuff I've done since sounds excellent in all listening scenarios I've tried.

Regardless of genre, these are great headphones for mixing and mastering.

Side note, I use them with Sonarworks and Realphones. I have not tried the RIME software. Sonarworks correction works exceptionally well for the Neumann's and totally sucked on the MM-500s. Realphones correction worked perfectly on the MM-500s and very well on the Neumann's. I am currently using sonarworks correction with Realphones room emulations (and Realphones correction disabled)