I installed ST on my newer machine when the old one packed up. No problems with it , I just don't like the Crawler toolbar so, although it is set and working I have it Hidden.
I have it set for a Fast Scan daily at 1300 hours and just noticed a nice little pop up that showed 'Countdown to Scan' and counted down from 10 seconds, which is a nice warning in case you think something is wrong. It takes 59 seconds for a fast scan and so I just let it run and have a breather whilst it is scanning.
dave