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My current vaporflys have 500km on them and still going strong - I think the flyknit uppers make a big difference too and the sole unit seems to hold together better (I have others which were knackered after 250-300km)
Really wasn’t a fan of the streakfly - I found them a bit of a nothing shoe tbh so interested to hear what you liked about them.
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They’ve slightly killed them by almost constantly discounting the others for the last few months, but for me they have the grip of the Alphafly, but with increased flex and lower stack that make them feel more like you’re doing all the work and they have just enough of the squish and pop of the alpha to not make them feel like running in bricks like other shoes do for me now and at half the price they feel like almost good value..
I realise how long shoes last is a combo of how you run and seemingly manufacturing variations but my last pair of vaporflys were down to the carbon plate in around 100km so have given up on them…
Nike Alpha fly/streak fly - I discount the Vaporfly as while they’re very nice the soles don’t last at all. Nikes returns policy is very good too (as long as you buy direct from Nike), I had a pair of alphaflys that got a puncture last week after about 180k, walked into Nike and got an instant refund, would have had a replacement if they had any at the same price but not wanting to spend an extra 150 on alphaflys 2s at the moment.
Not much tops these two across a wide range of speeds and distances for me.
If running really hard the ASICS metaspeed sky is top choice for me, but for me that’s <3:45 per km that they are really amazing and they seem to stall at slower spees for my mid foot gait.