I have the 990 PGII, it's pretty light. One thing about cassettes, when you are looking at 990s, XT and XTR, the biggest diff is in the lockring. Most of them have aluminum (or composite in the sram) carriers, with steel rings, but that steel lockring vrs an aluminum makes a pretty big diff. It doesn't shift quite as smooth as when I was running shimano stuff, but it works, no complaints.
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