Garmin Edge 305 - worth buying?

I have a forerunner 305… which I like. Just find it a pain to use on the bike, especially in races.

Is the edge 305 worthwhile? Costco has it for $189… seems like a good deal.

Though I want to get a powertap over the offseason - is it better to only get that or will the 305 still serve a purpose (GPS i guess…)