The Davis DASST trigger came from TotW. My major complaint with it was that the blades were fairly thin, and, the holes (through the blades and trigger itself) for the pivot pin was larger than the pivot pin diameter, which resulted in a rattly trigger (side to side).. My remedy for that was to buy a numbered wire drill bit, and drill out the plate hole, and trigger and blade holes. Then snap off the shank of the bit, using that as my pivot pin. It wasn't a perfect solution,---it's still a bit rattly--- but it's better than it was.
I've learned to get used to it though, as, when it's loaded up and ready for the break, it doesn't wiggle during the break itself. It's almost a 2-stage sort of thing.
The other issue with that Davis unit was that the trigger plate was very very thick, and wasn't easily bent to conform to my stock profile. If you bend it too far, the catch hook won't engage the set trigger blade. A lot of that (too shallow of a sweep to the TP profile) could be modified and remedied with judicious filing, but it was a major major pain to get it all working correctly. It also necessitated a change to the trigger guard bow shape to accommodate the forward sweep of the trigger during the set process.
There are plain SST's out there with no primary pull feature. That is, the trigger can ONLY be fired when it is set.
If I had to do it all over again I would either use one of those, or go the simple hinged trigger route instead. By my guess, I probably had 12-16 hours worth of brain wracking in to that whole installation and modification--as well as the pucker factor) , and a simple hinged trigger would only be a couple at best, and could be done while maintaining normal blood pressure.
