Don't know those shoes, However you can generally find very good condition carbon shoes with little use on eBay. I recently bought some Zoom fly 3 to see whether they would have any impact and the difference is quite remarkable in my road distance times.
I keep toying with the idea of buying some ‘super shoes’ despite my distinctly average performances… I don’t want to use that particular power-up until I’m at my target weight and already sniffing-around my 20m 5km target.
Any of you lot in New Balance Fuelcell's trying to weigh up the Rebels vs RC Elite's I'd like a carbon plated but also I'm tight!