Well, the easiest way to find out how coffee-flavored tea
tastes would be to brew your tea in water that was heated in a drip automatic coffee maker. That'll give you a fairly accurate idea.
Most find it dissatisfying. Coffee aficionados find it thoroughly insipid, tea nerds bemoan the loss of delicate flavors, and others find the mere idea to be an excellent exercise for their gag reflex. There will be the odd bird that finds it a grand thing, though. There's no accounting for taste.
Coffee leaf tea
, however, tastes nothing like coffee...and not too much like tea either. It's just kinda...weird. You know...that ambiguous herbal/stewed leaf thing that's not unpleasant, but not jaw-droppingly awesome either. You can find some here
if you're really interested.