Had a Gen1 Keltec sub2k, blew it up, never replaced it because i dont trust plastic receivers anymore....having said that, keltec warranty was awesome and hassle free...a definite plus, and the gun blew out the side and magwell, so the engineering was on target...but it broke the folding hinge.
Replaced it with a JR, nice soft recoil, accurate....but was a total POS to take down and clean, small screws etc.. and the wiggle in the magwell, was very annoying, couldn't slap mag into magwell (in the manual, they specifically said not to do this) couldn't insert a full mag on a closed bolt...very annoying ......and no last round bolt hold open....hated that
Dumped the JR, never would buy one again...
Got the Ruger PC Carbine, took a bit to get over the ugliness, set it up for me......absolutely LOVE it, very high quality, very solid, no rattles, last round hold open,drop free mags that dont rattle in the magwell, and slap the mags home and it functions well...and is modeled off the tried and tested 10/22 design....and super easy takedown.
Also its only a matter of time, probably sooner than later when aftermarket stocks will be available from boyd's (for awesome wood/laminate stock choices), hogue overmoulded rubber...love to get one in ghillie green...and of course magpul will make a backpacker x22 version for the PC, which would be awesome..
There is talk of ruger very soon coming out with conversion kits also..
The PC Carbine is my choice.....hands down