The Haku Venna is a restricted lung RDA, wee bit airier than a Derringer. Derringer is an antique in vaping terms, ancient! Brilliant wee RDA though, was my first dripper and I used it along with an SMPL clone - man I loved that setup
I had the 1:1 clones of the originals and they were spot on quality wise; FT started stocking V2/V3 etc that had a different post design from the originals and were pretty poor in comparison. If your one is leaking it's because you need more cotton in it than you think, and you are over dripping - 99% of RDA's will leak if you over drip, the Hadaly is very prone to it too. Hadaly has seriously good flavour though, arguably the best I've tried! It's not the best for squonking though, very easy to over-squonk, but a classic RDA all the same - I've had both clone and genuine, the top cap orings are way too tight on both and it's difficult to get the top cap off, I'd recommend removing one of the orings, helps massively.
The Pico squeeze is essentially an unregulated mod with safety features and a 50w max. output, power output is dependent on the resistance of your coil and power decreases as your battery power does, just like a mechanical device - undoubtedly a classic device and brought squonking to the masses, very cheap and very, very cheerful
The Pico Squeeze 2 is a fully regulated 21700 battery mod with selectable power output of 1-100w, decent enough mod but has never got anywhere near emulating the success of the original.
HTH.
