Heard the Vanatoo Transparent One (not the current Encore) years ago at a show and liked the sound.
I'm careful to differentiate between "active" and "powered". Powered in my book are simply passive loudspeakers with a single channel of amplification built into one or both cabinets and use a relatively simple high voltage crossover. Active use a more sophisticated low voltage (often digital) crossover that feeds one channel of amplification per driver (a vastly superior approach). Note that nearly all professional monitors are active. As I understand it the Vanatoo Transparent One was powered and the current Vanatoo Transparent One Encore is active.