I loved Gish and Siamese Dream. I have all sorts of bootlegs from that era of them, rare and live stuff (much of which has been released officially by now). Mellon Collie is good too.
And I've always hated, hated, hated his voice. In some ways it was cool live because he'd just get as ugly as he could, just like, wow, he doesn't even care, and you know, I listen to tons of people who just scream in the mic like that. But, its also borderline unlistenable at times. And I say this as a fan.
But, I also am not about to get my hopes up. I remember getting excited to see Zwan play with Queens of the Stone Age and Turbonegro, like half the QOTSA tour was opened by Turbonegro and the second half was going to be Zwan, and this show was like the break point and all three bands were supposed to play, only to find out that Corgan had gotten upset that Turbonegro was on the bill too and got them kicked off the show, which bummed me out, and then played one of the most boring sets I have ever had to sit through in my life. Dude has the hugest ego and his music has been rather crappy since Mellon Collie (although that Hole record wasn't so bad). I'm thinking the necessary ingredient to getting them to gel wasn't any band member but might have been Butch Vig.