GMABooster did deliver on its promise, even if the performance of the netbook was still far from what a normal notebook would score. It's hard to really complain about an application that is free and actually does improve 3DMark06 performance as it claims. When it comes to netbooks, most users will agree that you take any performance gains where you can get them.
Overall, the GMABooster application is easy to use, costs nothing and works. The only bad things I can say are that you have to download a new version each week and the server used for the downloads is a bit annoying with its wait period for free downloads.