just a +1 on the Lexon saddle (Ryet Aircode is the model, if I'm not wrong), I've commented some pages ago but I think it's worth mentioning
the construction is really well done, the rail bond as mentioned is much better than most chinese carbon saddles, the 3D is 'simple' but seems good, been 3 months and it's holding well I believe (and hope) it'll last long.. Shape is a complex subject, it's too personal, but I've adapted well to the 'pro stealth' shape it has, the wider nose and the relief channel I like a lot, no discomfort in long rides
as far as the advantages of the 3D print surface, I honestly think it's still mostly marketing at this time - even if you go to the top of the range ones, from Specialized, Fizik, SelleItalia...
it really doesn't seem to do anything much different then a good advanced foam padding does. Dif density is something doable with padding, the weight is not so different as far as I know. Maybe one benefit is that the 3D structure keeps it's shape even after long hours of use (at least theoretically), while foam is bound to compress and require some time to go back to the original shape - this could impact comfort in really long rides.