I also tried upgrading from OGNL to SpEL on a Spring project recently and was surprised.
At first I thought that SpEL wasn't really a drop-in solution when I got some initial errors after switching, but SpEL (in depth intro at JavaBeat) actually caught a bug at compile time that OGNL (wiki) would only notice at runtime (and thus wasn't found before).
At least configuring Spring Web Flow for this is easy!
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