new XXXL VS the XS's an1 side by side compare yet?

[basspro 0]

OK folks. I am getting ready to drop a sizeable order with my freinds at Powerbass, but am wondering if anyone that has used the XS subs, & swapped to the XXXL subs, what they thought of the change. I have a customer that I did 2 XS15's, & wants to try the XXXL's, & I don't want him to spend the $$ & not get as much outta them....so let me know what y'all think....please no lip service, if they are better great, if not please be honest...as we are talking about $800 of this guys money (I would be selling him the XXXL for $400 each)