I think it very much depends on what type of music you prefer. I don't find them satisfying on any type of large scale music. Orchestral or rock sound very weak and a sub doesn't solve the problem. This type of music requires a large woofer that plays above the subwoofer frequency range to sound right. A small woofer can't provide a realistic punch. I think you need at least 8" and 10 or 12 is better.
On the other hand, if you listen to smaller scale music, I think small monitors and a sub are fine. I find them nearly indistinguishable.
On the other hand, if you listen to smaller scale music, I think small monitors and a sub are fine. I find them nearly indistinguishable.