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I'd absolutely not buy a Tenkara. If you know how to cast a conventional rod, you have much more flexibility than with a Tenkara. If you have a kid that you are getting into fly fishing, or fish smaller water, especially with no obstructions around, than Tenkara might be for you. Otherwise, go with a conventional rod and reel.
The appeal of a long rod in a small stream is to not need to cast. With a long rod you can "dink and dunk" instead of large back casts (which tend to tangle on small streams)