They're popular here as they've been available for a few years and are non-restricted, which means that you don't have to take them to a range to shoot them.
But literally every single person I know who's run one in 3-gun, for example, ended up going back to an AR to be competitive. I find them manageable but not ideal. I don't like the sight offset and up here, you're changing mags all the time.
But this is the first time someone whose opinion I actually cared about has given one a serious go, so I'm interested to see where this goes.