Sorry to bump this old thread..
I have been to Finga's a couple of times, and the food is definitely great - if not a little pricey.
But where else can you find a huge chicken, bacon and avacado burger with fries and gravy in Taichung?
However, the staff there have no social skills at all. I thought maybe it was because I don't speak Chinese (well), but my Taiwanese friends said the same thing.
Go for the food, not the service.
I went for breakfast recently though and they have a new girl working there who did my head in.
She was smiling and chatting with everyone, running around the restaurant and making everyone feel at home. It was a very big departure from the normal level of service of there.
She didn't look Taiwanese though, probably Filipino or Indonesian or another one of those poor 85NT an hour people