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I`m using a Flyknit racer at the moment (along with various other shoes). Not sure how different it is from the trainer.
The racer is very light (7.5 UK weighs 170g). Cushioning is good. Not as good as a Lunaracer, but still very good. I could (and probably will) run a marathon in them. Fit is glove like and comfortable. Grip is amazingly good on wet or leafy road/moderate trail. Rather better than my Hoka Rapanui trail/road shoes. Don`t handle slippery mud. Don`t know about longvevitry - suspect not great but certainly not awful. Main downside: price.
What mileage have yo done in them Geryi? I'm considering them for my next racing shoe.
I've only ever got as far as trying on a mate's pair and doing a couple of laps of a track. Not surprisingly, felt like slippers, and the sole felt like a nice ride, but I found the knitted upper just didn't keep my foot in place. I'm tempted to look at the Zoom Streak as my next (marathon) race shoe, as I understand it's basically the same Zoom sole but with a more traditional upper, and I wear Zoom Elite for training. (Cheaper as well!)
No idea I'm afraid, beyond what I've read on t'web, but it doesn't look like they've changed much. My current pair are version 5, and I'll be getting the same again because I've had 1100 miles out of them with no complaints. I prefer them to v4 and they feel a bit like v3 for being a little softer.