I've been using it for awhile, and while it's a little clunky in spots, it works pretty well.

I've also run into situations where it doesn't want to accept my skill or language selections and move on (not just with rogues). I haven't figured out what prompts to

 write my paper. That said, you can still go through the rest of the generator and create the sheet, it will just have a note on it that it's incomplete.

I've also seen some random weirdness (Nature clerics getting the Light domain power, skills getting assigned to the wrong attribute, etc) but it's very rare.