Getting back on-track, here's a question for you... Since you mentioned your CX4 Storm, how would you rate/compare the two in terms of easy-of-use, ergonomics, weight, feel, etc. Arguably the JR is more modular in terms of accessories, but the CX4 Storm does have the compact bullpup design going for it; magazine capacity and base price is approximately the same for both (albeit this wouldn't include a NR barrel for the CX4).
The Beretta is King of happiness in left-handed land. I have yet to find another firearm that so easily and completely converted over for those of us that shoot from the
correct (as opposed to the
right) shoulder.
Been a while since I had the Storm, but I'd say its ergonomics were superior, and balance also. Weight was possibly similar, though the JR looks like it should weigh more. Maybe because of the ugly handguard.
Compared to the CX4, the JR mag release is a bit of a pain (especially for a lefty), it doesn't have a last shot hold open, requires tools to disassemble, doesn't have an ambi safety, doesn't come with any sights, has an unbelievably shiny silver bolt handle (mine is now painted black) and a somewhat mismatched finish. Oh, and the handguard is ugly.
The plus side for the JR is it mostly feels like an AR, uses many standard AR parts and accessories, kinda looks like an AR, uses Glock mags and is significantly cheaper (esp. at $729) than a non-res CX4. And it comes with an ugly handguard at no extra cost.
For some reason I just didn't like the Storm though, and sold it not long after acquiring it. In spite of its faults/shortfalls I prefer the JR, and if I can get a different handguard

p) I think it'll be a keeper.