This is probably one of the best sounding Tubescreamer emulations - can get a nice mild overdrive or can turn the gain down and the volume up to tighten up guitar amp plugins. The only issue is that I can't resize the GUI - it's absolutely massive on my laptop, which feels silly for a VST with three controls. I'd give it five stars if the GUI was resizable.
This is always my final step when mastering songs - brings the levels up and glues everything together without completely crushing your mix, and you can also add some gentle saturation to the highs. I tend to use the simple GUI because it's less visually busy.
I honestly think this is one of the best VST chorus plugins, free or otherwise. The controls are simple, but there's still a lot of versatility - can go from subtle stereo widening to full on lush chorus.