Reverb here (echoing Mike Lavigne's echo). Our comparisons were also with the Talea 1. The Talea 2 is reportedly a sonic improvement, which would only increase its advantage over the TriPlanar and Airline.
With regard to why some arm designers choose wood, I've spoken at length with two (Frank Schroeder, Joel Durand) and neither is seeking "warmth" or any sort of coloration. The idea that wood adds warmth (other than visually) is a myth. (Proof: the Talea is not particularly warm sounding. Schroeders are but that's due to the mobility in the "bearing", not the wood in the armtube.)
Wood is a chaotic material comprised of millions of random grain boundaries at varying angles surrounding cells with differing sizes, shapes and densities. Such a structure tends NOT to allow standing waves (resonances) to propagate or reinforce each other. Acoustic energies which flow into wood tend to be repeatedly scattered into disorganized packets with randomized frequencies and amplitudes. This makes it easier for the arm and armboard to dissipate them, rather than reflecting organized energy back toward the cartridge. Result? An armtube that adds LESS color to the signal than one made of (say) an organized (crystalline) material like most metals.
Of course there are ways around this for the maker of metal armtubes. For example, one could make a tube of sintered metal. Expensive, no doubt, but probably effective in similar ways to wood. I don't know if any metal armtubes are actually made with this in mind or not, just sayin'...
