I bought a Snap recently and it’s been working great with SYSTM and RGT 
One thing worth knowing… there’s a hidden Factory Spindown in the Wahoo app (different to the regular Spindown). It’s worth doing that once. Mine was reading about 20w low until I did the Factory Spindown. Matches real close with my crank PM now though.
Edit: you get to the hidden menu by clicking here 10 times:
