I have tested a sample Advanced Alert using the in built historical test feature on the Alert service. The findings can be obtained here.
Our key aim is to get a dedicated data provider (IDC) in place by mid-August and the latest Silverlight charting also up by then. This will solve many of the problems for our European users on missing stocks (including some US ones unfortunately). The updated charting will also correct the now obsolete version on the site following the latest Silverlight upgrade.
Dr. Declan Fallon, Senior Market Technician, Zignals.com the free stock alerts, market alerts and stock charts website