You can't drag and drop the generated XMLs into FCP (it gives you an "unrecognized file" error). You have to import them one by one using the "Import XML" dialog, which takes a LOT of time. Also, every imported XML gives you an error log since it can't find the associated media file.

It's prone to errors when encountering weird ASCII characters, with no explanation whatsoever that this is the case. I had to work with your support guys to figure this out.

It generates an empty sequence with the markers at sequence level. It would be great to also have the option to generate an XML for the clip with the markers embedded on it, this would save a LOT of time importing into FCP. (MovieLogger does it this way, for example)

If you work with video files with embedded time codes greater than 12 hours, they give an error when importing into FCP. Also, support told me this, I didn't know FCP didn't support sequences with time codes greater than 12 hours. It would be nice for the program to give you an alert if this happens. and not have to consult with support to figure it out.