We were quite happy with the SL on our last visit. It's not the nicest hotel we have ever stayed in but the staff were lovey and very attentive. Food was excellent, we ate at the restaurants and had room service. The pool was OK, no service as such there though.
The MO was full of Chinese groups being escorted in and out of the restaurants, which were packed when we went to visit. There were renovations going on too, but the pool was closed when we visited, so that was the main reason we chose to stay at the SL. We travel with our children so that was paramount in the decision!
Is the FS opening soon or are they just residences? This would be my choice if there is a hotel attached, as the location is superb.