My husband and I recently stayed at the Eco Spa Highland for 1 night. The staff are very attentive, and always ensured that we were taken care of. The Eco Spa is a pretty relaxed place. Lots of places to sit in or outdoors. Very peaceful and quiet, and very scenic, overlooking the mountains. The grounds throughout the Spa would have looked nicer if the grass was cut, and the gardens weeded.
Our room was spacious, and the bed was comfortable. Nice bathroom. It would have been nice to have had a lighter blanket on the bed, rather than a heavy duvet since it was summer and quite warm even with the AC on.
I think we would have enjoyed the Spa facilities so much more if it was the fall, winter, or early spring, since it was much too hot to be in hot water or saunas. But it would make for a nice get away location. Not sure what the winding road would be like in the winter however!