This only goes to show how the subjective evaluations of things are so different and varied from person to person.
You can note here
how a friend and I auditioned some Monitor Audio S8s and we thought the bass was more robust than the Axioms (M60s). Saturn also replied with a similar experience.
You reported that the Silver 9i (nearly identical to the 8s) had less bass.
Isn't that interesting eh?
It seems you enjoyed the M50s though and for this reply i know kcarlile will be pretty happy. The difference in sound is subtle. Too many ppl report the difference being a dramatic (and overexaggerated) 'night and day'.
I like the review, as short as it was.