So far I have been without this script. I too had raised the difference between ohmd and this script but didn't pursue it till the end. Frankly I am not seeing any noticable difference now as I am using a cron job to run optimizen900 script every day around 5am. This cleans up RAM and makes my n900 feel much snappier.

I am currently gathering some battery graph for without patch and powerbias/nopowerbias.

Seems power kernel 47/46 had some battery issue, though not confirmed by every one. Waiting to put 48 version to see if helps.