Wow, that's seems very HIGH!! I paid $265.00 for my 1000 mile service with Syn 3! Did they check everything? Don't know...I suspect they probably cut a corner if they could.
About same price I paid for my first 1,000 mile service with Syn3 in 2008. After I took over my maintenance @10,000 mile service I did discover dealer was cutting corners. i.e. did not lube steering bearing, torque spec check certain items etc. I do majority of maintenance myself now.
Before taking my '09 Electra Glide Classic in for the 1000 mile service, I changed the motor oil/filter and the transmission fluid myself. I had them do the Primary fluid, and whatever else the service required. Cost me $154...