Early ones had issues, they replaced bbls with a new style and that supposedly fixed a lot of the issues they were having. Mags have to be carefully loaded or they jam. They have promised a carbine version using the same mags, so far vaporware and probably will be for a while. KelTec everything is hard to find, they have a high demand and apparently limited production capacity.
People who have them seem to like them, except for the issues of them jamming and blowing up in the early production. Very light weight, and very loud! There is one at a local gunshop here, probably will be for a while as he has $900 on it. "Street price" based on their MSRP should be in the $350 range, doubt if you will see even MSRP for a few years.