I'm not sure he does parties as big as 50 regularly or events that are more cocktail style but I had a great experience with Garrett Gourmet. My fiance surprised me with a roof top proposal and private dinner by this caterer.
Our menu: Cambodian rice wraps, pan seared blackened scallops, crab cakes, mascovi roast duck with a merlot/port/chambord reduction, cheese late, and german crepes that he used a special ice wine we had been saving to make the whipped cream. The crab cakes were probably the best I've ever had- panko crusted and pan seared- chock full of crab meat and a mixture of asparagus, bell peppers, scallion, onion, carrot, celery, garlic and spices. The Roast duck was perfectly cooked and the sauce was delicate and amazing.
He basically comes to your location and uses the available kitchen if possible. The food was delicious, well presented, and reasonably priced. All in all, a great experience. We are using him again to cater our wedding reception (40 people) in June.