Way Huge Green Rhino MK IV

I'm using this primarily to boost my ENGL Invader 100, tightening up the heavy bass on the third channel. High gain application.

It's a great sounding and super versatile boost. Using the 100hz and 500hz dials I can really tweak it to the ENGL, which can get overly nasal and thin with some boosters. Not this one, I dial the 500hz down a bit and 100hz up. Problem solved.

Only negative is that those two dials are VERY sensitive. Small tweaks go a long way.

Can't compare it to say Maxon OD808 or a TS9, never owned those. Definitely step up from my old Digitech Bad Monkey though.

When I first started playing guitar I had the classic "green overdrive", and I've used it a lot in different applications but I've never found the sweet pot on that one due to the nature of my rig and the tonal characteristics of the overdrive itself.
Then I bought the Rhino, and I've found a huge palette of sounds, a totally different gainstage, a much more fuller and inspiring sound, and finally a surgical eq approach thanks to the 100 and 500 Hz pots. But if you're a nostalgic of that classic "green overdrive" sound, you can toggle the Classic switch and benefit of the gain characteristics of the Rhino.
If you're on the market for an overdrive... then you want the Green Rhino!