I own the 4000 model. I got it primarily for the headphone output and built in synth for convenient practicing. I am considering purchasing the EWI USB as a backup. One thing to be careful about is that this should not be considered plug and play when it comes to Logic. The instrument must regularly be adjusted to suit your playing style and comfortablility. For example, you have to set up the breath sensitivity of the EWI to transmit Expression via MIDI, rather than Volume, then make sure that it feels natural for each patch that you play via MIDI. I am sure all this is preset for their included software, but to play Logics instruments you will have to adjust play sensitivity to the charactorisics of the software instrument patch. The bite sensor controls pitch at an extreamly high resolution, flooding Logic with MIDI data even when you are not actually blowing through the mouthpiece. It's designed to get more of an expressive/human feel but when I try to play it through Reason via MIDI, reason says it's just to much / overflow. EWI is kind of a MIDI hog. Also the instrument can be very sensitive to static electricity because of its touch sensitive controls, which have to be adjusted for differenceds in tempurature and stuff (doesn't take long) but its annoying when you first learn how. Hopefully they made the USB model a little more common sense, friendly, and better constructed. IMPORTANT: Unlike the 4000 model which has an 8 octave range, EWI USB only allows for up to 5 octaves, so you can't play with the same range as Micheal Brecker's. I really enjoy playing mine. It takes a couple of weeks to really get used to. The durability and quality of construction is questionable, but it delivers overall as far as a tool I can use as an artist.