After my purchase, I noticed a need for improvements, particularly in the area of identifying the source user of the device, which can sometimes roll back to the base. Additionally, there were challenges with SSL gate traffic, which wasn't functioning as effectively as expected. Even though there have been fixes to these issues, they should be inherent to the product and need further attention. These aspects, especially sub-features, aren't very robust and seem complex. Regarding integration, while Sangfor Internet Access Gateway (IAG) integrates well with its own products, its compatibility with third-party tools like QB is limited. There's room for improvement in making protocols compatible with various third-party products.