I own an original, 48v, version of the Creation Labs Holy Fire.
Clean boost, OD, and/or distortion. It's more or less transparent, responds wonderfully to attack, and will get pretty fuzzy if you dime the OD and distortion knobs. You can adjust the gain (clean) to eliminate volume changes between turning it on and off, which is nice.
Sounds good with solid state, and it'll turn tubes into electric fire which is wonderful.
The giggle-worthy best part is the words are cut through the chassis, and the LEDs inside change colour based on the amount of signal, so you get a baller little burning fire effect. It's fun in dark room.
The only downside is it's 48 volts. So, you're forever tied to it's included power supply. I think there's an 18v version out now.
The multi effects does various distortions, too, but they all sound very digital and sh*tty, it's also 16 years old, so it's expected. I don't use it's built-in dist modules, anymore.