the board instead of coming up in the middle goes down on a rocker board. it makes a real nice floaty and skatelike feel, along with effortless butters. you may have thought it was more responsive because it was smaller then your main board though? the k2 does seem to be a nice board though. did you ride the wwwrocker?
others like the k2 are the rome artifact and artifact 1985
lib tech skate banana
all in all its basically a jibstick which means its really soft, has dull edges, and is a twin tip.