The app itself is quite OK. But when you run it, which is what you want to do, of course, it will eat up your battery very quick. Furthermore, the creation of invoices is limited and doesnt support e.g. German standards and localization, and therefore it is useless for most countries. Sorry guys, there is still lots to do. Especially for localization… in case you want to give better support for other countries and languages, you should go for professional localization, not for Google translate crap!