Buy the refurbished unit, sell the unit, use the money to purchase the Wahoo.
If you keep it it is still a Garmin with all the Garmin software glitches. One day it works the next day you lose a function because of an "upgrade". After two Garmins (820 and 830), my next one will be anything but. How a company like that stays in business is beyond me. Maybe I just answered my own question because idiots like me purchase a second unit hoping the first one was a fluke.