What exactly is the reward for completing the tutorial?

It is said upon new account creation that if you don't complete the tutorial before level 11 IIRC then you can't get some reward. What exactly is that reward?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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