Here in California the Davis/Cobra is the only derringer you can buy. They have a test called a drop test and the Cobra/Davis passed it and others didn't or didn't submit one to check.
I bought a Davis before they changed the name to Cobra for $80. I got the short barreled version in .38. Well, you aren't kidding about that trigger pull, but that thing is very shootable if you do a couple things. One thing is that if like dropping the hammer with the trigger. Squeeze the trigger in a downward type motion. It works better that way. Me? I can shoot mine real quick by slip hammering. That is a two handed method of first squeezing the trigger and then drawing back the hammer with the thumb of the off hand and letting the hammer fly. It is fast. It can also be dangerous, because one thing you don't want to let happen is get a finger of the off hand in front of the muzzle. I actually won a pocket pistol side match a few years ago and beat out some that were shooting top break S&Ws.
Now, as far a derringers I have tried, the one to have is the Bond. That is a very well made derringer and best yet is they have a barrel system, where you can swap barrels and calibers. That derringer can be slicked up some too and are very popular with the CAS crowd.
You have a well made derringer not legal in California to sell and then you have one made of pot metal that is crude that can be sold in California. Go figure!