i talked to big bass lloyd (the guy who did the great 12 challenge) he told me the WMD is a very solid woofer for the price and there buy one get one free now, if you can still find one. my vote goes for the WMD even though, they dont have awesome low-end extension
i can tell you first hand that i have talked to john pierce many times and the customer service is unbelievable. he is extremely courteous and he awnsers all my questions thoroughly not only that but he helps me decide what tunning would be best for my system and helped me figure out what box would yield the response i like, so once again i vouch for a great company in pierce audio products