After having played on this map several times, it is definitely one of my current favorites and maybe even the best Halo 5 Pit so far.
The play is absolutely solid, but it goes beyond the recreation of the Pit's layout. The map has been adjusted to fit Halo 5 play style, which is dramatically different than Halo 3's. All interactions on the map feel natural, both through the lens of Halo 5 and the lens of nostalgia.
Beyond gameplay, the theme is a polished A+. Alpine is but a mere backdrop for the training ground setting and the attention to minor details ensures there will be no mistaking the theme.
I'd recommend this map to anyone looking to blend Halo 5 and Halo 3 in a way that is both comfortable and enjoyable.
Personal Note: The pop-up targets are amazing and seeing them in action brings the map to life.