Hi Tomaso, I noticed you also sent an email about this, and Danielle Kairovicius sent this reply:
You don’t need to compress to state 0 but I know you need high precision. Here’s some tips: http://resources.arcgis.com/en/help/main/10.1/index.html#//002n00000076000000
I know earlier this year, another large utility looked at going to st_geometry, but ran into an esri bug with st_geometry and choose to stay with sdelob. The version was 10.1. I'll see if they'll respond to this thead.
I was trying to do some research. So far I found this thread on the esri forums, Forums
We are starting to migrate to 10.2 and unless we see really compelling speed improvements, we are staying with sdelobs.