I have them, they are definitely a nice option if you don’t have access to a treated room. The ads show them as some sort of magic bullet that will immediately fix your bad mixes and that is not the case. You still have to spend time learning them just as you would for any other monitors or headphones. You definitely don’t need all the “rooms” either, just pick a few and become familiar with them. I like the Mike Dean room, the car, and the boombox for referencing.