I used to own BP7000SC, BP7001SC, CLR3000, SC Trinity, BP10B, SM450.
I do think DefTech speakers sound pretty great when compared to just about any speaker out there.
In terms of FR measurements, I haven't checked any recent DefTech measurements, but I think the speaker with the flattest FR was the Mythos ST towers, which was less than +/-3dB. Most of the DefTech I've seen measure around +/-3.5dB to +/-4dB. I think the FR of DefTech is comparable to most B&W & Klipsch, but not as flat as Revel, KEF, etc, but still flatter than some others like Wilson, Zu, Martin Logan, Manepan, and the older Legacy Audio (don't know about the new Legacy).
I think their FR publication on their website is very bad and is the root of all evil-bashing DefTech has endured. They simply need to publish their +/-3dB FR. Simple as that.
Yes, measurement is not everything. The actual sound is more important. But it is still important to have better information on their website.
A good friend of mine DenPureSound (RIP) had the opportunity to enjoy the BP7001SC before he passed away. He first bought the Aperion flagship speakers, but it didn't work out. So he went to a local dealer and auditioned many Klipsch, DefTech, and GoldenEar. He fell in love with the BP7001SC.