It's always worthwhile tinkering with a new framework when it appears. It'll help give a good feel for what it's good at, the problems you'll encounter with it, and when to use it.
However, the decision to use a particular framework for a non-trivial application should be made carefully. I'd never choose a framework I had little or no experience with for anything other than a small application, because you simply don't have enough information to decide if it's a good fit. For something small it won't matter, but for a large application you'll be maintaining for a while it will matter.
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