This is my review of the Sigma 150mm F2.8 EX DG HSM APO Macro (non-optical stabilization) version.
Pros: Well made, very good quality and sharp.
Cons: The material that Sigma choose to coat this lens make the lens seem cheap, it feels like felt and wears poorly, the auto focus is not all that reliable.
In a nutshell, if your into Macro and need a medium reach lens - this is a serious contender, Sigma now makes an updated version of this lens.