I completely agree with Kevin. The amount of disinformation about the SR125i on these forums is surprising. They are not a "dud" or "the weak spot in the Grado line" by any stretch of imagination. They are a noticeable improvement over the Alessandro MS1 in my experience. They compare very favourably to my SR325is.
I have written my subjective impression about these headphones in a post a couple of months ago:
hope it helps.
I cannot believe the amount of wrong information about the MS1i's here !!
The MS1i's are not based on the SR125i, they are based on the SR80i. They have the same thinner cable as the SR80i and not the beefier cable that the SR125i has. And the MS1i's do not have the same driver as the SR125i. The SR125i does have the same driver as the SR225i.
As far as sound quality, I find the MS1i's do not sound good at all. They do not have the bass that the SR80i's, SR125i's, SR225i's, etc, have. The MS1i's sound like the SR60i's to me. No bass. Thin and unsubstantial sounding. Unauthoritative. The MS1i's have the same/similar mids and highs that the SR80i's do, not as refined as the SR125i's. But no bass. I don't understand anyone who would prefer the MS1i's to either the SR80i or the SR125i if you actually can listen to each model back to back.