I have no negative comments about this free little plugin. It sounds great, its free, the CPU useage is minimal, the GUI is clear and functional, and it seems to end up in every tune I make at the moment.
It excells at adding a touch of width and weight to anything you apply it to, but it can also be quite unsubtle if desired.
There really isn't much more to say than that.
You should also grab the other 'classics', Classic Flanger and Classic Reverb.