Subwoofer was toast. Any bass sounds were fuzzy at any volume.
Repair went great! Didn't run into any issues. I have a second hdd where the optical drive should be but it's mounted in a kit that's shaped just like the Superdrive was so I didn't have to vary from the instructions much
It was a little difficult to fit everything back together. Make sure the speaker cable feeds under the gap in the metal bracket and tighten that bracket down as much as you can to get everything to fit back in the case.