Great unit, but I wish there was more control
Overall I'm very happy with the device. It is solidly built and extremely easy to use and program. The controls are logically laid out and it's got all the inputs and outputs that I need.
I do have some things I don't like. Primarily that there isn't very fine grained control - especially over the core tone. It's designed to be "easy" to use, so all of the settings are very basic/shallow and rely on the presets.
The overall sound quality is great, and like with most things, the effects sound good when used in moderation. Many of the harmony and other effects tend to "sound" like effects when it's just you in a room singing - there is a "digital" sound that's obvious you're voice is being processed.
For some of the effects this makes sense because they are supposed to be extreme (T-Pain style auto-tune, alien and robot voices) but for others it's distracting. When playing with a full band this isn't as noticeable since the natural reverb of a room or club masks it. Because of this, it would only be useful in a live environment, not in the studio which makes sense having the word "Live" in it's name and all :)
More about limitations:
According to the manual, you can set tone on each patch/preset as an "effect", but there is no such configuration page in the settings (the manual says there are eight effects, but there are actually only seven - the missing one being Tone). I updated the firmware to the latest version, but it's still not there. For overall tone you don't have any kind of EQ, gate, or compression settings - just a handful of presets, which is disappointing.
The advertising leads you to believe that the ambient mics will pick up the sound from the stage and atomatically set the key for harmony and auto tune effects. While this is true, it is limited to a single instrument being close to the unit; ie: it's not going to work sitting on the ground in fron of you with the whole band playing, it would need to be close to a single guitar amp, or keyboard. Since it takes aux in, this is kind of useless. It is isn't a big deal, really, but a let down. I primarily play bass in my band and do background vocals, so it doesn't really apply to me.
Definitely worth the money, and some of my gripes may be fixed with future software updates. Depending on your needs, some of the other pedals in the line may be more appropriate. Even with the limitations, this is perfect for a lead singer, or a backup singer like me who isn't doing solo performance with a guitar or keyboard.