michaeldlanders
We have sailed on six "dam" ships, but not the Oosterdam. We will be on the Zaandam when your cruise starts. As far as boarding times, usually around noon. We have never tried the specialty restaurant--maybe we will on our cruise.
As far as our experience on HAL it has been nothing but great. The ships seem to have more space per passenger and the service has always been outstanding. The food has always been very good. Also, we have never encountered the chair hogs like some of the other lines we have cruised. Everybody has their favorites on everything from cars to cruise lines, and HAL happens to be our favorite!