My 9mm JR has run fine, in fact I'm using it in our MDPL side match later today.
Major take down requires an AR wrench and a hex key...hardly a "tool kit".
Basic cleaning can be done with just the wrench or by leaving the rifle intact and spraying & scrubbing.
Sure, the bolt hold open would be nice, but it's hardly that big of an issue.
If it was, then military and tac teams would never have given the Hk MP5 a second look...it's all about the training.
For a "fun-gun" or CQB (sub 100 meters) kinda stuff it does fine, but I admittedly wouldn't use it for 100+ carbine matches.
The added bonus is that being NR, I can go out to a pit / bush and set up my own CoF to practice and don't have to contend with ranges or the fuds there..