For the Wolf's guenons this is a brilliant exhibit, and for the pygmy hippos it is a solid one but nothing spectacular. The hippos have a decent amount of space both on the land and in the water, but it is truly the guenons jumping around everywhere that make it an excellent zoo habitat. The slender-snouted crocodile enclousure adjacent to this exhibit makes for an impressive, one-two knockout punch.
I agree, the hippos have a decent exhibit, but the guenons have a great exhibit to live in. While I was there, I enjoyed watching a juvenile wolf's guenon jump around the exhibit. The hippos were also very active.