>>Anyone have any experience traveling on COPA?

Done it once, PTY-MIA.

>>How easy was it to upgrade?

On this particular flight, I got my upgrade at check-in. I guess it's entirely dependent upon how full it is in FC.

>>How was F/C service?

Nearly identical to CO US domestic FC service. You'll think you're on CO - their planes are equipped identically except they say "Copa" in stead of "Continental" on them.