What is the forums opinion of SVS subs?

Soix is 100 percent correct.  I own two of the SVS subs he speaks of.  I've had them over a year now.  I am happy with them and do not regret the purchase!  Good luck on your decision!

I sure like my pair of 3000Micros! They do exactly what I'm asking of them and at a great price point. 

I have SVS micro 3000 and a friend of mine has a pair of Rel. They both sound good to me but I prefer being able to make adjustments from the app in my listening position. My buddy has to keep getting up to make adjustments. In this day with all the technology we has getting up just seems so archaic.

Before you purchase either a Rel or SVS, I would suggest looking at Rythmik. 

+1

I have owned at least 5 SVS subs, luckily they have an excellent customer service department for the warranty as every sub I got from them (two via one of their dealers stores) failed.   I took two of them apart to view the guts and I was not happy with the build quality from what I saw.

Another item, I could not get them to sound right in my large room when they were operational; the sound to me was very muddy and not musical at all; very boomy sounding.  

I ended up getting in a very nice sub from Axiom Audio (who owns Bryston by the way) and all I can say is what a nice improvement that was.  The amps are rated far lower in power than SVS, but trust me, they have a lot more power as they use linear power supplies with much more reserve.   You should see the capacitors and massive toroid transformer; it must weigh 30 pounds.   Plus they are super musical with a great amount of adjustment available on the variable phase controls and cross over points.   I ended up with 4 subs from them and the sound is just outstanding.    I'd suggest a look at what they offer on their webpage before getting anything from any other company; plus they have outstanding customer service and warranty support.   That's my input on this subject.