I used to be in the pro-actives camp until my own experience with them. I read all the great reviews and also lisetned to (sounded great) and bought the KEF LS50Ws but after having different issues with 3 (yes 3!) pairs of replacements I finally managed to get a full refund from the dealer.
While there is probably an advantage in that you get a properly matched amp and speaker in one system the downside of losing everything if something goes wrong is a huge negative, at least for me. It doesn't help that none of these speaker companies have any meaningful warranties on their active systems with 1 year being the norm (at least the ones that I know of). I was lucky my KEF LS50s had all the issues in the first year itself so could get replacements and finally the refund.
While there is probably an advantage in that you get a properly matched amp and speaker in one system the downside of losing everything if something goes wrong is a huge negative, at least for me. It doesn't help that none of these speaker companies have any meaningful warranties on their active systems with 1 year being the norm (at least the ones that I know of). I was lucky my KEF LS50s had all the issues in the first year itself so could get replacements and finally the refund.