Why not to first try best classifieds script in action?
We've prepared osclass demo site, where osclass can be nicely tested. Feel free to create new users, listing, test registration & publishing process, speed of osclass, search page...
Data on demo are cleaned regularly every week. Demo looks exactly same like clean osclass installation (except data).
Alternative demo site
In case of problems or maintenance with our primary demo site, you may take a look on alternative demo.