My wife and I spent the majority of our Dominica vacation in Roseau for the diving, but on the way back North we had the opportunity to spend an evening at Rosalie Bay. We are very, very happy we did. This was one of the most beautiful resorts we have had the opportunity to stay at, and an experience we won't forget.
June seemed to be a bit of a down season, so we were among very few guests at the resort. Even still, we had attentive staff and we had the opportunity to meet the owner, who was clearly passionate about the resort she brought to life.
This didn't necessarily impact the stay itself, but it's worth nothing that the Rosalie Bay staff and management have taken great pains to help revive sea turtle nesting grounds in Southern Dominica, and there is even a decent chance you will receive an early-morning wake-up call to observe the nesting behavior. We were unlucky, but this opportunity (made possible largely because of the staff's conservation efforts) is hard to find most places.
I could go on, but I think I can summarize by saying it's hard to imagine we'd return to Dominica and not find a way to get Rosalie Bay on our itinerary. Outstanding experience.