What is the forums opinion of SVS subs?

What is the forums opinion of SVS?

I have been thinking about adding a sub and started studying Rel. Then I saw an add for SVS and l gave them a look.

I have seen time and again this forums praise of Rel. So then when I was looking at Rel's specs compared to SVS, It APPEARS at on paper that SVS digs deeper at -3 db than Rel at -6 db, at a lower cost. But how do the two compare in their sound?

Thanks