Night and day my friend. The 1-cs are going to be a lot more laid back than the Klipsh, more natural but with less bass, very open sounding non-box speaker that provide quite a lot of detail. If you take the time to set them up the soundstage is very nice. I went from mid 70's Heresey's to Cornwalls and then to vanderseen 1b's when i needed to down size my system. Word of warning(?) the vandersteens are NOT a rock speaker at all. The vandies are good speakers when you want to listen actively or when you just want background music.
Vandersteen or Klipsch
Currently have Klipsch KG4. Looking at the Vandersteen 1c. Have a tubed Cary cd player and will soon add a tube integrated, maybe Pathos, Unison or similar. Should I keep the Klipsch (and the bass extension along w/94 sens.)or go for the Vandy's? Thanks.