New subwoofer

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Hi Guys
I'm appealing to the audiophiles among us for opinions on what looks to be an awesome sub to replace my aging REL Strata II.
It is the SVS PB12 Plus.

Manufacturers web page
http://www.svsound.com/products-sub-box-plus1.cfm

Full review (5 page)
http://www.hometheaterhifi.com/volume_13_1/svs-pb12-plus-subwoofer-1-2006-part-1.html

I can get one for £459 which seems like a tremendous bargain for what it can do.
What do you think?