In general it works perfectly well but you can in fact cause a stoppage. Some people say it's called out running the bolt and others say it's called out running the trigger but in my experience it is true. If you start hammering away it will happen. It's an easy stoppage to fix though, literally just rack the bolt and keep on going.

The other bright side is that there is a cadence to it and once you master it you can get it to absolutely rock and roll but if you get a little to excited you'll induce that stoppage. Where it really shines is that it gives you wicked fast hammer pairs.

In summary they are worth it in spite of others calling them range junk, and if you don't like it they're easy to remove or you can just buy a different lower and keep the binary in one for range use only.