[racket] Off-topic: Scheme for JVM?

Until Racket has a back end to the JVM, what's a good
alternative?  Wikipedia lists Bigloo, Kawa, SISC, and JScheme,
(http://en.wikipedia.org/wiki/List_of_JVM_languages) but I've
never used any of them yet.  Although not a dialect of Scheme,
Clojure gets a lot of attention.  

Any experience or opinions? 

Thanks,
MJG