To be honest, I do not use this plugin at the moment. It is true, that fixing the errors described in the previous posts led to rates that could be aquired through the UPS Api, but at least for UPS germany they made no sense and changing parameters like carrier services or pickup types ended up in a mess. Furthermore, the correct rates heavily depend on valueable information of product weights and dimensions, which isn't so easy to have for all products especially when combining an arbitrary number into one single package. I rather stick to the manual shipping provider at the moment. Later I want to develop an UPS plugin written for my needs.