What is the forums opinion of SVS subs?

I own the SVS SB2000 Pro. It sits upon my homemade bungee trapeze which isolates the sub from floor. While waiting for delivery,  I didn't have much hope, To my surprise, the blending with my Klipsch Lasalas is wonderful. I had all but given up on ever getting a sub to play nice with the big floor standers. Previous subs include Velodyne, Polk, Sunfire and other brands. See? I really tried. Honestly I purchased it expecting to return it as a failed attempt or try again by getting up SVS's product line to a bigger better unit. (Crutchfield returns policy is easy)  Once set up, the sub did what every sub should- It simply disappeared and allowed the music to become the focus! Five Stars

I use a SVS PB2000 pro sub with my JBLL100 Classic speakers and the single sub really made my system go from pretty good to incredible.  Like others have said, their software to integrate the sub is excellent and easy to use.  You can make adjustments on the fly too. I was going to add another of the same sub but the system sounds so good with one, that I don’t want to spoil the magic. 

Compare the warranties before you decide.  BTW, I've owned 2 SVS subs and both were problem-free.

the REL is probably the most musical sub on the market, integrates extremely well with your speakers.

I have the svs sb16 ultra it took a little more work to tune them with my tekton's than my klipsch but once I got it there you can' tell where the sub ends and the mains begin. I also got the svs isolation feet that work really well I have also put them on my tekton's. The 1 sub gives me more than enough bass.