Personally, I'd give it a 2 on a scale of 1 to 5 in terms of usefulness.
But it really depends on whether or not you need the spectrum-matching feature, as that's the only real difference between the two plugins. Some people don't need it, some think it's snake-oil voodoo, some depend on it for their livelihood.
For myself, I do use it but not that often. MDynamicEQ, OTOH, is my first-call go-to EQ for critical tracks such as vocals, and for busses. It gets used in every project.