I have listened to the Diamond, Evolution, and Opus series. I only listened to the Opus once, but have listend to the Diamonds and Evo's several times.
At their price point, I haven't heard anything better than the Diamonds. A terrific value for the money.
The Evo's are also a very competent speaker. They have excellent midrange and bass. What I like most about both, is their attack and decay. Bass and midrange are precise and punchy. The highs are detailed, yet the overall sound is slightly warm.
To me, the Evo's shine more on 2 channel music than they do on HT. Most of this I attribute to a lacking center channel that mangaged to detract from the overall HT experience. Overall a great speaker in many respects.
