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@Retro_Bastard
I took my new alphaflys to the gym this morning for some b2b testing against my endorphin pros. 2x5k (4min km pace) tempo then 4x1 (3:35km pace) mile threshold off 2mins walk recovery. Only 1bpm difference between in the Nikes favour. In the last half of the last mile i had a 3bpm rise in the Nikes but my form was starting to slip so put it down to that. Feel totally different to run in the Sauconys have a more flexible upper but a more stable midsole and the Nikes the other way around. The Sauconys feel livelier and the Nikes don't feel as fast as they are and are bulkier but not heavier and are more cushioned so a bit easier on your feet and muscles. I think with these two its just a matter of taste and preference rather than one of performance for anyone looking at getting either of these in their quest for speed. I'm going to keep the Nikes as i really like the look of this ltd edition and just for the sake of alternating for a different feel and I've got them both now but if i could only keep one it'd have to be the Sauconys and thats completely ignoring the fact they were £80 cheaper as well.