Our little PRV's can, and do block, as can the poppets on our posts, I think it's incumbent on the users to ensure that the pressure rating of the vessel (whatever that may be) is not exceeded.
I've mentioned it before, if you chuck a sh*t load of pellets into a lively brew with insufficient head space expect things to clog up, it's what blow off tubes are for.
We have a conundrum, "minimise head space" fair enough, "ferment under pressure" (not sure why but it's all the rage) so fair enough, but then we want to brew an Imperial Neipa, result: clogged poppets/PRV's, and lines, and taps.
Sure there's ways and means of doing it, but judging by the amount of failed pressure vessels on social media a lot of people are unaware of how to do it safely.
I suspect a large number of failures are due to the inexperience/incompetence of the users.
It's pretty obvious that KL have had some issues, otherwise they wouldn't have offered replacements for units with stress cracks around the necks of some of their fermenters, as far as I am aware KK have not had similar issues.
KK fermenters are made in Australia, KL's are made in China, using different methods, and a different design, KK's have a higher pressure rating, and a somewhat fool proof design, so we're not comparing apples with apples.
End of day look at both, decide what features you want, and how much you want to spend.
I've got fermenters from both companies, and haven't blown up any of them yet, but then again I have a vague idea of what I'm doing.
