The Dali Megaline is an active system, but doesn't include the amps. It comes with the speakers, and an active crossover. You provide the amps. Albert Porter uses this system currently.
I think that active speaker driving is a very good idea. I think Sean also does it. There are many advantages, because the crossover is not in the high-power realm, but in the line-level realm(where it is more elegantly and easily done).
Also, single-driver speaker systems are "active" speakers, because they don't use any crossover. But they generally don't get into the deepest bass region.
The concept is good, has been around a long time, and can be rewarding if done correctly.