I have experience with a Reed 2A (red cedar, 10.5") in my system and with a Talea2 in my neighbor's system. The design espoused by these two companies is quite similar and both owe a lot to the Triplanar, save for the use of wood for an arm wand, now not a factor in the Kairos. However, they do differ in that one uses a modified unipivot (Durand) and the other a gimbal type bearing. My sense is and was that the two tonearms have a lot in common sonically and both are really excellent, assuming the Kairos is as good as the Talea. I don't think you can go wrong in this choice, so spend the least amount of money, is my advice.
Because of the hoopla around the Durand record weight, I looked it up on their website. Wow! $3500!!!! I note that they use a sleeve, apparently made of teflon, that is sized to fit the spindle of one's particular turntable. Seems to me that the teflon sleeve would effectively "shield" the weight itself from any energy transferred via the spindle/bearing to the weight, or at least reflect a great deal of the energy back into the spindle. Then also, the weight is supported against the LP label by 3 tiny sapphire beads. Thus there is minimal contact between the LP and the weight, as well. So, what good can the weight do? It's energetically shielded from its environment. Not my $3500 cup of tea.