Did Uncle Exchange A Good Axe For A Stick?
"Zamienił stryjek siekierkę na kijek" is a Polish saying about a bad deal; someone has swapped something good for something else, useless. So, did uncle exchange a good axe for a stick?
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The smaller Wahoo Roam v2 has the characters big and perfectly readable even in the direct sunshine despite being a way smaller than the ACE. It seems a lots of potential was wasted in the ACE here. Roam 2 has its data  screen readable in any lighting conditions without the backlight for the daytime. ACE requires Auto MAX backlighting in direct sunshine.
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What makes ACE really better is a large colourful map. You can do a very long ride using GPS navigation and not scale the map even once! Scrolling and zooming the map with the Roam v2 is painful (buttons only). ACE allows touchscreen operations on the map even including manipulation of the map layers. There is a new data screen called Waypoints (similar to but not identical to Garmin). You can use a route with POIs, identify the POIs and navigate to POIs even if these are off-route. 
The feature I like the most about ACE is the voice navigation (yes, I do repeat myself, I know). I don't need to watch the screen anymore. Well before any turn, I'm reminded by "Gerda" that something would happen. Overshoot a turn and in just five metres away you are snapped at by that stern uniformed German woman: 'RRROUTE!' 
The Indicated Air Speed sensor has turned out to be useless for my Vado 6.0: the computer must be oriented totally horizontally for the correct readouts, which is impossible to do on my big bike. It is, however, doable on my Vado SL. A nice touch is the "Wind" layer that lets you placing a tiny colour coded IAS indicator on the map.
The ACE thermometer is very accurate. The Roam 1 or 2 thermometer indicates 3 C less for the cold season while the Garmin one always indicates 5 C too many