Have you tried them on? All the hype doesn't mean jack all if they don't fit your feet.

Why do you want the Ergo 1? They share the same 2-piece Hi-Tech carbon sole as the Sidi Energy and the Sidi Genius 5.5, which can be had for much less (if you can find a place that still has stock).

If you move up to the Genius 6.6 or the Ergo 2, you'll be getting the new all-carbon sole, but at a premium.