It's not just the extremely poor English translation**, it's not just the inaccuracies in the Help, it's not just the fact that the website offers no way to get in touch with the developer, it's not just the strange interface behaviors*.

No, not just one of those things: all of them combined make it somewhat difficult to use. This is all I have found in the first 5 minutes of trying it out. I'm not going to bother looking for more.

Most definitely not ready for Prime Time.

*Typically, if one tries to quit an app, you will be asked if you want to save your document. "Yes" and "No" are just that obvious, "Cancel" usually means "abort the quit and go back to the document." Not here. "Cancel" closes the existing document as if you have clicked "No."
**I don't mean to be a linguistic elitist here, but if you are going to market a product (free or not) to Anglophones, you can't just use an online service to translate for you.