Ive heard of Plastic kegs blowing up to fatal consequences before. I can only assume these could have the same potential problem if mistreated or mishandled. Throw in the fact that you could rpobably get a few 5g kegs and a used co2 tank for about the same money i would ask why you would bother? If its because of batch size they sell smaller kegs;)
Flat sides are nice for storage, but not great for holding pressure. Makes me wonder if the sides will bulge with carbonated beer inside. I’d like it more if it used a small regulator and paintball CO2 tank. I have one of those CO2 injectors for a keg and you have to babysit it at parties. Other than that, possible PITA to clean with just a small opening.
For the money I’d buy some 2.5 gallon kegs. They were on sale for $80 last Black Friday.
The PKA kegs that blew up were under more pressure than any homebrew process should allow. These were kegs being cleaned under pressure. At Yellowhammer we started with PKA kegs and never had one blow. We keep cleaning pressure under 40 psi.
That said, much prefer stainless. We won’t buy any more plstic kegs. But its not because of the explosions.