I’m sure I saw one of those pedal board videos on You Tube where Flea used the Q-Tron. Possibly for that sound in Sir Psycho Sexy, but I may be misremembering that. To be fair, he probably has a wide variety of filters to choose from.
I’ve only had the MXR and I does exactly what I want it to. YMMV of course. I think I saw a Marlowe DK video of him playing around with it and that sold it to me. Might have been this one.