I have the 990 but I'm guessing the difference of upgrading the amp will be similar. And that difference, at least in my case, is pretty dramatic. I'm running Axiom M80v2's right now (still in the 30 day "try em and if you don't like em send em back" phase) and they really came to life with the extra power. They are 4 ohm speakers and love the power (300 watts at 4 ohms). The extra "juice" has definitely had an impact in the sound quality. Much fuller and richer with 2 channel music which is mostly what I'm using at this point because I didn't yet go for the whole Axiom HT package. Really punched up the midrange and lower end as I suspected it would. Long story short, I'm glad I upgraded from the 7125.
And Ianion, I'm guessing there will be quite a bit of 7125 "B" stock available in the near future. I sent my 7125 back to Outlaw via UPS yesterday.
Regards.