Dave is correct. My 2006 Sprint I bought a couple of months ago had BT-021's on it and they felt vague and not very confidence inspiring. I ended up getting a pair of Roadsmart II's put on as they were available ( I found a nail in one of my BT-021's.. a blessing probably). I wasn't a fan of Dunlop motorcycle tires in general but these do surprisingly well on the Sprint (I think DaveM agrees).
In the Spring I plan on throwing some Road Attack II's on there to see how they compare and I'm trying to decide if the Sprint needs the GT version or not. I was very happy with the RA II's on my SV650.