First encountered Jennifer Egan when I read "Selling the General" as a short story in an anthology - it remains one of my favorite chapters in the book, along with "Goodbye, My Love." (Ugh, that one ended with such a punch to the heart.) I loved the multi-faceted presentation, and how running into the same characters in a different story triggered a jolt of recognition, like seeing a familiar face that's been rearranged by time. 
 I do have to agree that the last chapter ("Pure Language") and the jump into the future (and its attendant cringe-worthy netspeak) was a little hokey and a little too neat, so I pretty much... ignored that. The much-hyped Powerpoint chapter was nice enough, but not the strongest bit of writing so it didn't blow my mind or anything. (Maybe it's because I'm such a product of my generation. I just ended up skimming and going "that's nice," much like I do with almost all Powerpoints I encounter.) Ultimately, all I have to say is how much I enjoyed reading this novel and watching the pieces click into place. I lose my attention while reading so easily, but Egan kept me coming back.