I had the MI about 2 months ago, and it was trash !! The phone I was first looking at was the fusic, so after sending that M1 back I went and got the FUSIC and I love it, the fm transmitter is my favorite feature although the pictures and video are better on the m1 all around the fusic is smashing the m1.
The Fusic is older than the M1 and ther M1 has a faster internet speed because it has the latest software in it. The Fusic's FM Transmitter can be a bit weak but if you plug it in to a car charger thats's not a huge problem. The reviews from Phone Scoop and from Sprint so far has been that the M1 is overall rated better than the Fusic.