I had a test, here is my report:
my site is designed for Chinese-language user. Unfortunately, there are two sets of chinese data with different charsets, utf8 and Big5. I wanted to change all the data to utf8, followed your steps. However, your convertor not only cannot convert the data with charset big5 to utf8, and also change the data with charset utf8 to monster words.
I don't know, I might take some wrong steps
BTW, thank you for this great convertor and believe that a stable and great finall version is coming