I have the SMS-1 matched up with the EP500. I think it may be exactly what you are looking for. The key advantage of it is ease of use, and the real time viewing of how different tweaks change your room. I couldn't imagine how long it would have taken me to do what I did in 30 minutes with the SMS-1. I created a different house curve at two different seats. The funny thing, is I found that a different setting for variable phase worked in each seat. I think one is at 90 and the other is at 165. The SMS allows me to set differet values for each preset. I don't think I would have ever had the patience to figure that out with the BFD. It is actually kind of fun to make switches and flip back and forth and see if it made an improvement.
Before the SMS, my sub was tight and had impact. The difference now, is the sub still has those qualities, but now does a better job filling the room with what feels like more immersive bass, if that makes any sense.
