Give it a year into the production and then consider buying one. Anyone who buys this in 2025 will be setting themselves up for disappointment because it takes time for the guys running the machines, assembling, and testing them to know what to look for to make them as best as possible.
At $300-350 street price, this opens the door for more people to buy into the caliber that otherwise wouldn't and while it's not likely Kel Tec is going to make 100k of these over the next decade, the more 5.7's sold means the odds of the ammo going down in price due to increased supply is greater. Prices on 5.7 have come way down the past 5 years due to all the new guns having come out, but they still have a ways to go.
I've never been much into 5.7 before, but if things keep going like they are, I may buy into the cartridge if the Supreme Court throws us a bone and makes magazine bans disappear for a long while and at the price this will be, the Kel Tec may be the 5.7 for me.
Lot of ifs there tho and as it stands I'm not interested. I do love to see a fixed internal mag pistol tho, something different and maybe could be the start of some innovation as people rediscover something that had long been written off as obsolete.