Disappointing - the Heechee become one of the narrators, but the meeting with the humans is underwhelming. The Bladerunner-style voiceover (well, text over) is very irritating and makes me think the story was rushed and these asides added later to fill in holes.
At least Robinette's first love escapes from the black hole. Probably best to stick with the first book, or maybe the first two.