Lyngdorf TDAI 2170 vs 3400

Have you heard either, or any amps in the category?  I tried the 2170 after the rave reviews from the threads on the audio sites.  I should say that trying gear out is part of the hobby and fun for me.   I should have stuck with my gut that most of these guys don’t know what they are talking about .  Not only did I sell mine but you will be hard pressed to find any one of these “guru’s“ that  still owns one.  

From what I hear the sound quality between the 2 is not much different. Anything over 90db I would say the 2170 is plenty. I've used some inefficient Dynaudio Contour 20s and it could have used some more horsepower. I also find the 2170 looks much sleeker. 

I have not heard either unit (no dealers within my vicinity). I was intrigued by the reviews and the room correction potential.
What I have auditioned is listed below in order of my preference.
Luxman 550 AXII
Luxman 505 UXII
Naim Supernait 3
Anthem STR (room correction was not engaged, amp sounded very flat)

Aside from the above, I am also interested in a used Pass Integrated or Mark Levinson 585 (this may be a topic for another forum inquiry though!).