My 18" Q (same motor as the 12 I believe) with extra spider and cooling option just took a **** on recommended RMS power (SAZ1500D), dual battery setup, absolutely no voltage drops, gains set with oscilloscope... yada yada. Bought it in Sep 2011. I'm in the process of emailing Fi to see what they'll do to make this right. It looks like I will pay shipping there and Fi will cover the return shipping and repair costs, who knows though I'm still trying to get them to cover shipping to and from.. That being said, how Fi handles this will either completely win me over or turn me into a naysayer. I would like to officially cast my vote as "be cautious of the Q."