Don't worry, It is. In fact, I would put money on it that is.
Those ol' blue jensens above... My little cousin had one 10 in an acura that surprised me back in 04. Sub looked like a beast from the from the front. Jensen... so decieving!
I have wanted to get my hands on the X line since I heard about them. I am sooooo tired of my locals drooling over the Memphis MOJO and I havent had a comparable offering in it's price/power class even though the X line would be cheaper and obviously should out perform.
Where is the X? It appears to be a unicorn! LOL
Honestly, at some point, I wonder if the trade off in surface area is worth the added possibility of throw, but I am sure you have already ran those numbers!
You would be better off sticking with one sub unless you are shooting for a true subsonic response or a ton of midbass, then that would have to be a separate setup.