I also fell in love with it and bought one - and have yet to thread it up and use it. I've watched several videos. It only uses bobbin thread, and the needle is a hook that pulls the thread to the top to form the stitch - so you get a double thread stitch, then no thread stitch on the top. and a chain looking stitch on the bottom. However it's not a true chain stitch and is not easily removable.
I've got several tops I plan on using this machine on, just have not gotten to them yet.