SVS PB13Ultra-anybody have one? how good are they?

Are they competitive to a Paradigm Signature Servo or a JL Audio Fathom F113??? I really can't decide from the three....It seems the SVS goes lower(deeper) and louder due to a 3 port design, which is nice for a large room size. They are all nice in the black gloss, I do think the Signature Servo is in front in the asthetic departement. Price considering, the SVS seems the better buy for the dollar/performance. Anybody give me they're input...it might help seeing as though where I live(Thunder Bay,On) We only have a Paradigm dealer and they don't stock a Signature Servo, and I haven't heard the SVS or JL...I haven't heard much JL Audio F113 detailed input besides the add hype and "It will blow you away" quotes...LOL.soon to upgrade..time is ticking...