I bought one, and promptly returned it. The tip is VERY fragile. It basically arcs across the contacts, so you have to have a large surface, it doesnt work well with small stuff. It doesnt have the oomph for the big stuff.
Go buy a good cheap corded iron or a butane powered iron. I personally have a "Isotip" brand and it is Awesome! And it was only $20 + butane. Note, use GOOD butane, not the stuff for lighters. It will eventually clog the unit.
here is a link