I've had one for a few years, so obviously not a v3, but still an Auto Trickler. Before that, I was using a Chargemaster, and before that, an old RCBS beam scale.
The AutoTrickler will throw about as fast as you can seat, which is why i bought one. Well, that and I have GAS (Gear Acquisition Syndrome). The good is they're very accurate, very repeatable, very little drift, and very fast. The bad; don't use your scale in any drafty area or you'll see quite a bit of fluctuation from throw to throw, and that even includes an indie room where the AC will cause a slight current of air to mess with the scale. You might not even feel it, but the scale does.
With all that said, I saw very, VERY minimal difference between loads thrown on the Auto Trickler setup and my old Chargemaster. My SD and ES as far as I can tell are identical. My groups didn't magically shrink. In reality, it does nothing the Chargemaster doesn't do. It just does it a tad faster and with more resolution, which can actually work against you if you have OCD. Trust me, chasing that little 0.02 grain is a real thing lol. If you're trying to get your SD and ES down, the Auto Trickler won't do it. But if you have good numbers to begin with and you're looking to throw charges as quickly as possible, the Auto Trickler will do what you're looking for