My buddy and I got good deals out at Riverhead.
I can't say much about any of the service centers, all seem below average.
I've used Riverhead for warranty, fairly good, but not great.
I tried Portjeff Dodge, they screwed things up a bit, one of the service managers got fed up and left.
Smith Haven dodge, my father used them, lots of problems.
My dad used Browns Jeep dealer in Medford, good experiences, and has been better for buying OEM parts through.
I do most of my own work. All my experience has been with warranty work.
The only place I haven't had problems with is Ford in Sayville and Riverhead.
Both had good sales and service.