I have a 12W7 in a big ported box tuned low. The only thing I don't like about it is the output. I wish it could take more wattage. It hits hard, plays low and has great SQ as long as you don't overdrive it. I try not to give it more than 900 watts or so. I haven't heard the 13W7, but it is rated at higher wattage and probably plays a bit lower.
They are overpriced. I think they should sell for no more than $750 new. I think you will like it, but regret paying so much for it. I believe you would probably get more enjoyment per $ from trying out a few different, lower priced, recommendations.