As someone who just went through the decision between XV15se vs V1500, I'll chime in..
I was considering dual XV15se or dual V1500, but since I found out that 1 of them will be roughly equal 2-3 of my current sub (SVS 20-39CS+), I ended up with a single V1500.
For an extra $150, I would get the following:
- minidsp (which I think I would need anyway if I decide to go dual sub)
- lower extensions (16 hz vs 21 hz)
- 2-3db more output
- ICE amp
I thought it was worth the $150 for those things. Now that the minidsp promotion is over, it's a little more difficult to decide.
The only drawback w/ the V1500 is the look, but I never have a forward facing sub before and my wife approves it.
Besides, since I talked myself out of getting a dual now, I save at least $700 already..