The thing about all these things is once the "lightbulb" finally goes off, in so far as how to tune them, that's when you can start to really shave some time off. For me, it took getting my head around the "spillover" that occurs.
They all work on the same premise, whether it's a spinning tube or a vibrating tube, that when you change a parameter in order to "hit the brakes", there's still some residual flow or "spillover" that happens (which varies, depending on the powder type/size).
Once that clicks, and you start to account for that "spillover" after "hitting the brakes", you can start to really play with the parameters to really get great results and shave seconds off a drop time.
I'm using an RCBS MatchMaster, but have been watching this thread because I do believe the ST is the state of the art and will be buying one if my MM doesn't work out for me. But, since wrapping my head around the "spillover" that occurs after "hitting the brakes", I've got my MM dropping in under 10 seconds and may not need one. (FYI, with the LEO/Mil discount a MM costs 1/3 or less than an ST.)
I mean, Austin Buschman won the world championships and got second in the PRS finale with ammo loaded on a lowly ChargeMaster with its crappy 0.1gn resolution... so there's that. So maybe it's better just to spend more time, you know... actually shooting, than messing with our fancy powder droppers lol.