I was able to catch most of the M83 show here in Austin. While good, I was equally impressed with Swedish opening act I Break Horses (not to be confused with the Seattle band of the same name, or the Portland band Sparkle Pony), which played a very tight set.
Their online music is good, but they’re much better live, and I’d recommend catching the M83/I Break Horses tour if they come around your neck of the woods.