I wrote the entire back catalogue for my uni band on this thing, you can literally record every instrument, even drums!
Tracking is amazingly accurate, and play a sax solo on your guitar can be really fun, but even the 'boring' guitar models on this are excellent!
The build quality is solid, and it has literally every effect you could dream of built in, with enough tweakability that I didn't even delve as deep as this pedal can go. The presets are often so good that you can plug and go, and play a whole set with them.
For performing live, I would recommend a midi footswitch to switch between banks, as the three patches that you can load at once may not be enough at times, depending on your genre.
Honestly, I personally wouldn't use this to record string/brass sections etc. to my actual recordings, but as a creative or performance tool it excels, and the sounds are still strong enough for recording high quality demos for your band.
Highly recommend, it will change the way you write music!