I believe you mean Neos.
Is the carbine the only deciding factor? Cuz I got a Neos, but not for the carbine option. I originally thought the carbine would be cool to get but then realized for the price of the carbine kit you could pretty much buy a rifle and have 2 guns instead of 1 that converts, so not really worth it in my opinion. However, the price of a new Neos at $250 is hard to beat and I got it cuz I like it.
When choosing a gun, the most important thing is how it feels in your hands and that you like to shoot it. If you haven't already done so, you should go to a gun store and hold both to see which feels better. Or even better, shoot both if you can arrange it. You'll know instantly if you don't want one. Some people do not like the angle of the Neos grip and the placement of the slide lock.
Based on my Neos buying experience, OGC and Gun Source are the only stores that stock it regularly.