I don't care for slide myself but I love old Foghat...the Foghat Live album was great. I saw them on the Stone Blue tour in Detroit and they were excellent.
Foghat was one of THE bands back in high school (yeah, I'm old...), but I got really tired of them - they were so overplayed at the time you couldn't escape it. Having not heard it in a long time, it's "new" and enjoyable again.
I saw them at the Convention Center in Indianapolis with the J. Giles Band in the early 80's. Awesome show. J. Giles flat F'n rocked it, too...