interesting topic. the new balance fuel cell md-x spikes: underrated and very low key in comparison to the new nike spikes (air zoom victory & dragonfly) but in my opinion (and a lot of other runners) it's maybe a better version than the new nike line up.
Nick willis (2 time 1500m olympic medallist) dropped this on his twitter about the nb spikes: "OK, I'm a believer in the new spike tech. Ran 2 seconds faster than expected for a time-trial tonight. Wore the NB version that everyone has been tearing it up in."
Other runners (eg jake wightman) smashed records in these ones as well.
but here is the interesting fact: they aren't available for sale. this is against the new shoe rules. everyone was going insane when the nike line up releases too late but the NB's just never came out and nobody is talking about it. It's weird, everyone is chatting about nike and brands like NB can do their thing without resistance!