I got my (pre-owned) Washburn RB2802 nearly a year ago. I'm currently using it on a few of our songs. Yoshihiro Naruse of Casiopea rocks an 8 string. I use it more on guitar-heavy country/folk stuff, but I'm thinking of giving it a go on a rocker or two.
The saddles on this Washburn do not allow tuning each string of each pair separately, so matching intonation can be a challenge. A new bridge isn't in the near future because of expenses.... That said, I love the sound! The lower octave is on the bottom, but I play fingerstyle sometimes, with my thumb sometimes, and with a pick occasionally as well, which allows me to get a different effect with each.
Years ago a friend let me play his Rick 8 string, and that hooked me. Did I say I love the sound?
Using roundwounds on it now, but at some point, I'd like to try flats. Anyone have suggestions on a set?