IF you like it then have fun. If they had come out 10 years ago, it would have been a huge hit. As it is now, the only competition is the KelTec Sub2000, which isn't much. The fact that it can use other mags is vaguely interesting but only with special adapters. Meh. Ill take my 9mm in pistols and SMGs (even the semi auto types).
Today there are better options and better cartridges for rifles. What is its role? Where do you use it that you couldn't find a better tool? I really wanted to like the PCC concept, and I do when in a much smaller package, (think AR pistol with a 7inch barrel). The Ruger just doesn't do it for me. Perhaps if they had made it in a better cartridge, I would have been impressed with 10mm or 30 Carbine (amongst others).
Again if you like it enjoy.