Thank you for highlighting the NAD. Never knew about that. Someone else also asked me to try the Yamaha Pro 500 but strangely (despite being a Japanese brand), that model is not available here (yet?).
I was demo-ing the Ultrasone Edition 8 Romeos whilst they were paying for the M-100's. I used to own the Ed8LEs but sold them off 7 months ago with the intention of buying the SigPros but have since forgotten the Ed8 sound. Listening to the Romeos again did sound very nice. One of the guys did have a listen to it after he paid for his M-100 and liked it. However the price was somewhat too rich for their tastes.
I think even $700 for the SigDJ was probably more than they wanted to spend irrespective of their impressions of the SigDJ over the M-100. i.e. it seems that for that $300 price range, the M-100s seem to be at the pinnacle of value for money...not just in its sound, but balanced with durability, compact size for a pair of circumaural headphones, nice design rather than anything too flashy or plasticky, etc. I tried enticing them with the LP/LP2s (since they were somewhat bassheads) but they kept to the M-100 for it's collapsed size.
They were even more impressed when I told them my unit that they heard had fallen into a frozen lake and its SQ wasn't affected. In addition, I showed them my M-100 being stress tested :-
All these tests I'm doing may seem silly to most, but believe it or not, along with that accidental frozen lake test and this, it has helped demonstrate the features and has helped sold the M-100 idea to these non-audiophile folks. It's slowly reeling them and exposing them to the audiophile world slowly through other means that they find attractive. Sometimes blunt approaches of talking solely about sound quality doesn't always work.