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Partly it’s legal, UK law no longer distinguishes between automatic and assisted opening.
When you get one that wasn’t declared by the (usually chinese) retailer and remove the spring, to avoid being arrested for owning a flick knife, the detent is usually so weak due to reliance on the spring that you risk arrest for owning a gravity knife.
They are also really unpleasant in action, sometimes dangerous. I once ordered a cheap knife to see if I liked the wave style opener. Turned out when it arrived that it was also an assisted opener - the wave would catch your pocket and the spring would launch the knife towards your armpit. I actually destroyed that one as a service to humanity.
I’m a big fan of ganzo’s work, but their low end blade steel is an issue for me. It doesn’t need a supersteel but a better budget to mid range steel option would really make their line-up more desirable. For £10-£15 more I’d snap this up in 14C28N or 154CM.