Trip 1 - booked Standard view for $119. When we arrived they bumped us up to Savannah view. It was great, at the end of an offshoot of Zebra, we looked right at giraffes and others, and if we looked to right we saw the flamingos and end of pool. Was an incredible view and we so enjoyed our balcony.
Trip 2 - so afraid we would get a standard room (without having seen a view) we paid the extra for pool view, savannah not in budget. Well we got pool view with no upgrade and it was a waste of money. We saw roofs, pool, lots of people and we never used the balcony. As far as we were concerned, a total waste of money.
If we go back, I'll book standard again and take a chance on an upgrade since they seem to happen often. If we don't get it, there are so many public balconies etc to view the animals, we will use them.