Oxymoron... This is dubbed "the crap speaker".
A recreation of the Auratone 5C Sound Cubes used in virtually all-major studios in the last 25 years. Word is that the biggest selling album in history - Michael Jacksons Thriller was mixed on this. Why? Because it is mono, and is basically a good representation of what people will be hearing when they listen to your recordings. It is not flattering, it's harsh and honest.
Many engineers use this as their balancing speaker - get the mix balanced on this and then use more accurate speakers or headphones to tidy things up.
I own and use this on every mix!