Tried FP Gamechangers (5mm) insoles for the first time ever yesterday. Shoe was the 600 (comes with the basic Ortholite insole).
Result: bloody amazing. I mean, NB# shoes are fantastic and most models offer at least adequate protection / shock absorption by default, but my old ass feet really, really enjoyed the added comfort by way of the Gamechangers.
Been thinking they're mostly hype, but based on yesterdays sesh (lotsa curbs / flatbar / flatground) convinced me.