Recently I added several prismstation 45 deg horns to a micropop. The horns on the prismstation is full aluminum, as is the radio itself. At first I was concerned about the azimuth getting changed if you ever have to swap a radio, but the swivel mount stays on the tower, thus preserving your aim. They seem to have good isolation, but I lose some of that having them in such close proximity.
Sync works nice (prismstations have GPS antenna) but I did discover that you need to have a reasonably good signal to noise ratio on the client, as it has trouble when it hears more than one AP to loudly.
I think I may need to adjust the downtilt a bit....bit much downtilt for a flatlander. I don't have many customers on these yet as this POP is pretty new.