So previously I reviewed the TFX, R2 and Spire in this thread:
I concluded that overall I preferred the R2 primarily due to less "pop corning". But the Spire 2 is probably the better general purpose hopper for most.
I must update that to say that the Spire 3 is better than all of them. Spire 3 is so good I think it is going make Dye do a fundamental redesign of the rotor. Like really, virtue just knocked it out of the park with the Spire 3.
The Spire 3 has as little pop corning as the R2, and feeds to the end of the hopper as well as the R2. The Spire 3 also now feeds as fast as the R2.
But the Spire 3 also gives you the crown SF. The R2 speed feed is utter **** in comparison to the Crown SF.
The Spire 3 also achieves all of this with way way fewer mechanical parts. The R2 has so many mechanical parts in it, gears, double layers of paddles. Whereas the Spire 3 is just a motor attached to the paddles directly, no gears, and all the magic of the spire 3 is in the software. The software very intelligently detects the rate and timing to move the paddles to feed it. You could almost say that the Spire 3 accomplishes digitally what the R2 does through analog means.
That one rotating paddle that connects directly to the motor is also attached via a magnet. So you can just reach in and pull it off to clean. Taking apart the R2 is a chore.
Aside from fewer mechanical parts being just a smarter design and easier to maintain. This also has two very real benefits. The Spire 3 is smaller, notably smaller. Before when it was R2 vs Spire2 size difference seemed negligible to me. But now the Spire 3 has enough of a size difference that the R2 actually feels unnecessarily bulky on my gun.
Since the spire 3 intelligently senses when to apply the motor and put pressure on the balls, this means that there is ultimately less pressure put on the ball stack. The R2 has a spring loaded feed so there is also a bit of tension of the ball stack. The R2 tension is light enough that I never had any real problems with it (unlike the TFX), but this is a point that can help. If you shoot very brittle paint less pressure on the stack does mean less likelihood of breakage.
Plus the spire 3 design is impossible to jam. My R2 never jammed, but I would certainly choose impossible to jam over unlikely to jam any day.
So overall. Spire 3 Feeds just as fast, popcorns the least, is the smallest, has the least pressure on the ball stack, is easiest to clean, has the best speedfeed.
Its a bit expensive right now but ya Virtue really did a great job on it and certainly deserves a good ROI on it. Whereas I think HKArmy kind of half-assed the TFX to just get to market quick. And I think Dye has been following a fundamentally incorrect engineering path on the direction the rotor is going. If Dye is smart I would think they would just scrap the rotor and try to copy the spire 3.