I have a JRC in 40SW. It's really a 50 to maybe 100 yd gun at best. From 50 to 100 the bullet drop is pretty large, but it will hit the target. Beyond 100, never tried, but I'd expect I'd have to aim into space to offset the bullet drop.
Pros: Non restricted, cheap ammo (I reload 40SW), glock mags, 10 rds at a time, easy access to furniture and add ons, looks kewl
Cons: don't like the manual bolt hold open on last round, gotta run it wet, bolt release is a little less elegant than an AR, take down takes a few seconds longer, not that accurate at 100 yds.
There were some early issues (search and you'll find but it seems they've got most of that sorted and they work pretty good now.
If you like it, get one.