Personally, I do not really care if the MQA concept is good or not, I just want to have the best listening experience possible.
Therefore, here's my thoughts on MQA (I have a non-MQA Border Patrol Se-i Dac and my Zen Stream / S Booster combo is doing the first unfolding) as I compare both for the last month :
MQA Tidal files seems more 'dense', details are a bit more 'in your face'.
Red Book Tidal : More air between instruments and perhaps more natural.
At first glance / for the first few minutes, the MQA sound is more attractive, more spectacular but after some time, I think I prefer the Red book files (more realistic / natural to my years).
I do not know if I would conclude the same with a MQA Dac but I think I will drop HI-Fi+ as most of the time, I prefer Red book files. Of course, YMMV.
PS : Qobuz is not available in Canada