SVS vs REL and experiences with both: your comments and preferences...

Yes, and I add in a HSU MBM-12 for movies. Better than most theaters! 

You realize that SVS started out making subs and only later added speakers and other items?

I've owned 6 SVS subs (that I can remember).  I've had no issues with any of them, including some that were fairly old when I purchased them.  I ran a pair of PB 12 Plus/2 subs for quite a while, but eventually went to all sealed subs.  Rythmik is another great option as is Power Sound Audio.

My main system includes 2 SVS SB 13 Ultra and 2 Rythmik F 25.  I haven't owned any Rel subs, but have heard them.  My subs are well integrated with my mains and only make themselves known when the source material calls for it.  I'm sure it would be nice to have 4 high output Rel subs, but I can't justify the cost difference and doubt that it would sound much (if any) better than my current setup.

@bacardi I don't want to spend thousands of dollars more to try different subs when what I have already sounds great.  What part of that confused you?

When did I say I tried a Rel sub?

@bacardi I don’t know which models they were. I’ve heard one of their smaller subs at the showroom of the dealer where we have our music club. It was one of the smaller ones, maybe one of the T series? We were listening to Klipsch La Scalas. I was actually surprised that little sub could add some meaningful bass to those speakers in a fairly large listening room. One of my friends has one of the larger Rel subs paired with a JL Audio sub. Maybe the best bass I’ve heard in a home system. Having said that, the same friend has been to my house and had very complimentary things to say about the bass my system. Two Rythmik F25s and two SVS SB13 Ultras.