We have stayed at several units in this building and 516 was hands down the most updated with modern and special touches.
Location is everything, and, while we usually stay on the 6th floor, one big advantage with the 5th floor is you don't get noise from chairs being moved around on the rooftop deck.
The unit has A/C, but we never used it once, the unit kept plenty comfortable with just the windows and doors open, taking advantage of the ocean breeze.
Everything is high tech, including state of the art TV and sound system, and automatic / electronic window shades.
The owner is very communicative, attentive, and easy to reach.
If you're looking for a well-designed, modern and comfortable condo in Kihei, this is the one!