the pair that I gave my son are still here and I'd been using them to play music from the PC ...they were OK as they were augmented with a pair of Sonance MB30's for HF. have no experience with xover upgrades to them, only what Mac's link said..
Centuries were replaced in my installation with AMT 10b's and havn't looked back.
Thats a fine price in the current market ...the pots prolly need cleaning, as flat spots are bound to be there by now.