I purchased this along with Smart Eq 2 and have been very impressed. It isn't your standard compression plugin, as it contains a spectral compressor, that analyses 2k frequency bands and adds compression independently. The results are excellent and even better if used with the secret weapon.. Sidechaining. When hooked up it ducks only the frequencies that clash with the source, giving a better blend between the two sounds, without losing too much information... all in real time.
In conjunction with the Smart EQ2, I've heard a notable improvement in my mix down sand definitely worth the $120 total I paid for the pair in the sale.