The food is indeed excellent - we had dinner there three times and lunch once. We were staying around 300m up the road at Locanda degli Agrumi, and this is the standout place to eat in the vicinity. Prices are reasonable for the quality of the food. Service is a mixed bag - depends on who you get as your waiter. We had 2 very good experiences with the service (on the first occasion the thoughtful waiter, made excellent recommendations and boned the whole fish my wife ordered expertly), and 2 were quite poor (I ordered the same fish - sea bass and it was not boned, I got no bread, no salt or pepper, wan't asked what I wanted to drink.
It's not worth going out of your way for, but if you're in upper Conca dei Marini, it's a good choice - and like everywhere on the Amalfi Coast, the views are sensational.