A couple of rides with the Roam (replacing a Bolt) and I'm pretty happy. The biggest positives so far:

• The character sizes for data fields with the bigger screen is a plus for older eyes. This was the main reason I changed.
• As expected it works exactly the same as the Bolt, so no learning curve setting it up or operating it.

I do have one beef (this would be true for the Bolt as well). The LED's are useless in direct sunlight & there appears to be nowhere in the setup app to turn brightness up or down. I don't get it, do Wahoo developers ever ride outside during the day? The side LED's would be a nice feature for those of us using power zones ( I don't mind hand entering iLevels) but are very limited by not being visible on 2/3 of my rides.