I still need to read that one, though it looks interesting (yes, I only got through the introduction and summary :)). Let's keep in mind that the authors already wrote several papers on OT (also ones that we based CKE5 on) -- so they have vast knowledge in the subject but may also favor one technology over the other. As much as I'd like to read that OT was the good choice I also want to be cautious in this regard :).