Special controller for Slalom

[strassy]

Has anyone ever used the ski controller for Slalom?  I'd like to hear any thoughts.

I'm also wondering if it's compatible with the Dualsystem, or if it will only fit/work with the Unisystem.  I'm looking to get something a bit different in the other side of my Dualsystem...I have RBI Baseball and Castlevania.  I like RBI because it's one of my favorite NES games and I like that it has different rosters from the NES version.  Castlevania is a bit bland to me because it's the exact same as the NES version.