Is not good.
This stamps connector is pretty weak.
With stamps software you have to choose the right package for a given weight, but with this connector you only have to choose a package or envelope from administration area.
Also, foxnetsoftware customer service is not good at all, there's no a phone, online chat or anything else to get in touch with them, they only have a contact form, when they answer, their typical responses are "i'll try to help you".
A vendor responded to this review
I haved added all your requests.