Husker Du was a band with an enormous amount of musical detail and introspective songwriting, which was what really set it apart from the other punk/hardcore bands of the time. Like other some other groups of the same era in underground music, Husker Du can't really be pigeonholed as a hardcore band or maybe even as a punk band.
'Flip Your Wig' is a very good album, not as good as 'New Day Rising' but every bit as good as 'Zen Arcade' (also a great album, but could have benefited from better production). As much as I like this album and enjoy listening to it, I don't think it contains Grant Hart at his very best. Here Grant Hart's songwriting, though signifying somewhat better craftsmanship, comes across as being somewhat more conventional and not as interesting to me than it was on the previous two albums. Bob Mould, however, is at his finest on this album; 'Divide and Conquer' and 'Makes No Sense at All' are some of the best songs he's ever written. I'd recommend this album, along with anything else Husker Du has done with the possible exception of 'Land Speed Record.' I also recommend that anyone interested in this check out Husker Du's SST label-mates The Minutemen and The Meat Puppets.