No, not really.
The only flat top battery I have tried in mine is an AW ICR 18650. (the only one I own)
If I listed all the of each of those brands that would work, it would get a little convoluted.
That said, using both AW and Efest 18350's, the Efest appear to be of lesser quality.
I get the same impressions as the scientific testing I have read on them.
The testing I read on the 18350 showed the AW coming @ a little over 800mAh. (labeled 700mAh)
The Efest came in @ a little over 700mAh (labeled 800mAh)
My AW's lose less charge after resting then the Efest's as well.
I tend to agree with you, from my experience the IMRs 'last longer' per charger than the Efests.