The Raspberry Pi is a series of credit card–sized single-board computers developed in England, United Kingdom by the Raspberry Pi Foundation with the intent to promote the teaching of basic computer science in schools and developing countries. The original Raspberry Pi and Raspberry Pi 2 are manufactured in several board configurations through licensed manufacturing agreements with Newark element14 (Premier Farnell), RS Components and Egoman. The hardware is the same across all manufacturers.
Using Raspbian GUI with default user pi might be not fun, but if you decided to create new user, you might have missed setting up polkit configuration to have new user in administrative authentication dialog. Here's my first Raspberry Pi guide to fix it.