Early 2015 we recorded a song with the HD Pro. Now, the same song we re-recorded a few weeks ago with the Helix: ​guitars, bass and vocals. My conclusion: there's just nothing bad you can say about the Helix :) Listen to the difference:
HD Pro:
https://soundcloud.com/amazing_air/all-the-strangers
Helix https://soundcloud.com/amazing_air/all-the-strangers-helixx