i'm not sure i'd make a good person to test because i might not have enough time / technical knowledge however i am really pleased to see more tools becoming available to make epub format ebooks. i consider one of the most important factors in the widespread, mainstream success of ebooks will be one standard format, and epub is exactly what we need. so i wish you good luck.
and i will happily beta test for you if you don't mind a dilettante tester.
