I actually liked Samantha better than Lea Salonga.
Agreed about Eddie and Amanda too. Their songs are usually the ones I can skip when I listen to any of the recordings (although I still love Michael Ball), but I love those songs on the movie soundtrack too. Eddie's gut-punching version of "Empty Chairs", Amanda breaking down when Valjean dies has so far destroyed any chance I had of making it through the ending without sobbing.
I loved the new placement of "On My Own" as well. As much as "One Day More" is easily my favorite stage moment ever, all Eponine does in that song is look longingly at Marius and Cosette - which she just did for two whole songs. Where it is now, she really understands that she's sunk as far as Marius ever falling for her is concerned, and from there through "One Day More" makes the decision to hide the note and follow Marius to the barricade, where they'll die together, without Cosette.
It also gave took Eponine out of Valjean's discovery of Marius, which let them focus more on Valjean finally learning that he needed to let Cosette go, which the stage musical didn't really go into as much, and made Valjean's story that much stronger.