The displays on the pedal are beautiful and the UI is well designed. Editing patches is quick and intuitive. The build is very sturdy and has plenty of good knobs. Sadly, that's all that I really liked about it.
I didn't like most of the initial patches. When trying to set up my own, I ended up not really liking the sound of the reverb. As the most basic effect I was probably going to use on absolutely everything, that's a big negative. (Clearly, this is 100% subjective.)
The big selling point of the Plethora is the availability of TonePrints which would allow you to go very much in-depth with your patches - many effect options are not available from the pedal itself. I was hoping to maybe create better sounds with the TonePrint editor, but the software turned out to be, let's say, not that great.
TonePrint Editor feels simultaneously oversimplified and overwhelmingly complex. Finding out whether you're connected and where to start editing is very confusing and underdocumented. Creating empty patches is impossible - you always have to start with a copy of an existing patch. When you finally get to the right place, the UI is basically just dozens of dials staring at you without any clear hierarchy or guidance.
This just wasn't an environment I wanted to spend a lot of time in, designing my patches - so I decided to send the pedal back. If you're just planning to work with the features from the pedal itself without software, and like the tone of the effects, this could very well be for you as the pedal looks and handles beautifully. But it definitely wasn't for me.