Well I was at the Buffalo Gun Centre yesterday, and got to handle one of the Sub 2000's with the 9mm Glock mags. I must say I was not really impressed. It felt really cheap, and is made almost entirely out of plastic. The length of pull is very short, and not adjustable, and I don't have long arms and I am only about 5' 10". There also doesnt seem to be any way to attach optics to it, which is another downfall if you ask me. If this thing is restricted and is just a range toy I dont need it to fold up, id rather have optics. If it does come in non restricted then yes it could be cool for backpacking and camping, as it does fold up quite nice. Now they are selling this thing for $379 and for that price I could see buying one, but If it ends up being anything upwards of 600 dollars, I will probably not be interested
the length of pull can be resolved with a butstock extender and the optics mounting solution is available for the sub 2000. see kel-tecs website they have all the accessories to solve your problems and more.
but i do agree with the plastic, it just seems cheap and i personally prefer something with some weight to it (if its not a backpacking rifle) when i look for a rifle.
the su16 is what I will likely be waiting for, but if this thing pans out with the the 20 round m14 mags i will probably be getting one of those.