Just succeeded to get my Alpha One installed on my Cervelo P3. It was a bit of a challenge with the brake cables, but by following this excellent forum made life a lot easier. The Alpha One bar feels great, everything (almost) fits in the cavity, the jagwire brake hoses take up some space and the 5 port di2 junction box gets really squeezed..so for the moment I decided throw it into the Bento box. Everything looks smooth though from Alpha One stem to bento so I'm not unhappy about it. I might cut the monopost in the future, we'll see.

Conclusion - the bike got a huge facelift. Legs did not get faster but the bike is :)!