If I install TweakMASTER and don't like it, will it return my system to the way it was before?

TweakMASTER may be installed with confidence. You have every reason to expect it will improve your download speeds and the general throughput of your internet connection. In any case, all your original settings will be restored upon un-installation or by using the "Original Settings" button on the Advanced Optimization screen. You can install and evaluate TweakMASTER without concern.