Although it is a little scary...
I carry a li-ion battery around with me everyday...inside my cell phone. Also have probably 4 or 5 other lion batteries around too.
M-Audio was certainly aware of this incident. I never heard of any other incident like this, which is strange actually. I mean, if it happened to a TS.com member, you'd think it would have happened to atleast a few others around the world.
I'd have to hope that after a year of tech advances, that they would have a new battery for the MT 2496. Although it's the same shape/size, I bet it's a higher capacity. If not, that's just poor business on their part as this is an easy upgrade to motivate people to purchase the new MT.