This pedal is truly magical. Its a blessing. No, seriously.
A device that lets you drop your pitch up to 7 semi-tones down, and even octave if you so want. It's so useful it's not even funny. You can essentially play your guitar in any pitch tuning you want, just with the flip of a switch. You could have your guitar in E standard, but still be able to play in B standard for example. You could have your guitar in Drop D, but just as easily tune it down to Drop C.
So for context, you can go from classic Metallica, to a Doom riff real fuckin quick.
There is no negative points about this pedal at all. Some people say there's a tiny delay, but I don't feel it. It's super snappy and sounds really natural, especially with distortion.
I'm having a blast with this thing. I can't tell you enough how stressed I get about messing with string gauges, nut problems and saddle heights when tuning down a guitar with heavier strings for real. But with this pedal, I don't have to worry about that at all. Its plug and play, literally. Perfect if you have an expensive guitar and don't dare to fiddle with it.
Just a little thing to keep in mind though. Your intonation and tuning will have to be super accurate, that should come as a given if you're messing with pitches. But that's not really a downside, it's completely logical. If you don't know how to intonate your guitar, there's plenty of easy tutorials on youtube, and it's actually pretty simple when you get the hang of it.
But all in all, perfect product. You will need this in your guitar journey one day or another.