It's an excellent, great-sounding product. it is really very easy to use. and it's free!!! It has the necessary controls so that the saturation works in bass, normal and treble. For very it is a must-have plugin.
It's a decent plugin by itself. Crunchy, analog-style saturation that can be applied to either the high or low end. What annoys me is the absolutely gigantic installer (over 100MB). Instead of just giving you the .dll, you have to go through and untick every limited demo they try to give you as well. Use Klevgrand FreeAMP or SGA1566 instead.