These two excerpts summarize where I disagree with SIAI:

Our needs and opportunities could change in a big way in the future. Right now we are still trying to lay the basic groundwork for a project to build an FAI. At the point where we had the right groundwork and the right team available, that project could cost several million dollars per year.

As to patents and commercially viable innovations - we're not as sure about these. Our mission is ultimately to ensure that FAI gets built before UFAI; putting knowledge out there with general applicability for building AGI could therefore be dangerous and work directly against our mission.

So, SIAI plans to develop an AI that will take over the world, keeping their techniques secret, and therefore not getting critiques from the rest of the world.

This is WRONG. Horrendously, terrifyingly, irrationally wrong.

There are two major risks here. One is the risk of an arbitrarily-built AI, made not with Yudkowskian methodologies, whatever they will be, but with due diligence and precautions taken by the creators to not build something that will kill everybody.

The other is the risk of building a "FAI" that works, and then successfully becomes dictator of the universe for the rest of time, and this turns out more poorly than we had hoped.

I'm more afraid of the second than of the first. I find it implausible that it is harder to build an AI that doesn't kill or enslave everybody, than to build an AI that does enslave everybody, in a way that wiser beings than us would agree was beneficial.

And I find it even more implausible, if the people building the one AI can get advice from everyone else in the world, while the people building the FAI do not.