On one hand I feel the same - Shen looks incredibly nice. And it features a lot of things that I hope Clojure will have in the future (such as an optional static type-systems and high portability due to Clojure in Clojure). Then on the other hand a language's usefulness is to a large degree determined by having a minimal viable userbase - you just cannot write every library yourself. And by being highly pragmatic, running on the JVM and so forth (and probably many other things I don't comprehend) Clojure has achieved just this. So I think right now its the most practical Lisp. If Shen has a lot of nice features maybe we can learn from it!