OK well I dont know if the GW8 & Harmony M will be "perfect together" because the Gw8 isn't out yet

....But I do know one thing, the Tyros & TC Helicon Harmony M is perfect together for my needs so far......now I have a decent arranger excellent styles & sounds & Super Vocal Harmonies when needed for live stage use & studio work also. This little VH unit sounds awesome once you set it up properly, been using it about 3 weeks now.
Thanks Gary for the assistance.
Bravo TC Helicon!