I have talked to Adam a few times via email. He was always courteous and responsive.
I have owned the V3 and now own a V4. Over all, I think the V3 is a superior unit. I bought my V4 strictly due to N570, which simply will not meter thru the V3. Mechanically there really isnt much that can go wrong with either of these units at this point. The V4 did have a few early issues, but that has since been sorted. I dont think he is going anywhere anytime soon as his business is obviously doing quite well.
The V3 gets the nod from me from a pure speed and simplicity standpoint. Turn it on, set the speed and angle on the trickler, set your drop to about 1/2 grain short, and run it. The V4 does require tuning. I currently have tunes for ball, short extruded, long extruded, and road gravel. I think I spent about 2 hours working it all out with CFE-223, 8208 XBR, H4350 and N570. I do get maybe a 5% overthrow rate, but I have the big drum tuned to run quite late in the cycle in an attempt to speed everything up. Id rather throw back a few charges, than wait longer for it to trickle up. I guess Im impatient.
I do think the Ingenuity trickler is a pretty sweet piece of kit, but the cost is gonna push people away when its minimum double the cost of the ATv4.