If you want to use this as a stand alone electric wind instrument; look at the more expensive models.
The sounds are "ok" for practice and play, but don't hold up in any professional capacity.
If, however you use it as a breath controller for a DAW with good breath controllable instruments / VSTi... then suddenly you have something that sounds great, and is a lot more expressive than just a normal keyboard.
I played saxophone when i was younger, and i wanted something to bring back the experience of a wind instrument in my music production. The Aerophone Go works great as something to just play with when I'm traveling and just want to practice or just jam. But when i hook it up to my DAW and match it with something like the SWAM instruments or other great plugins, then suddenly i can get really good sounding woodwind or brass in my tracks, with more natural breath feel. I LOVE IT!