I got my British before I turned 18 and my wife is worknig on her German one now(holly paperwork Batman!). I don't really see any drawbacks, but you may want to look at the individual countries(make sure their is no military service requirement!) My British one was useful, as I spent a summer working there. Much easier to get jobs with citizenship, and it is good for the whole EU.
I suggest if it is ending soon, do it. You may regret not doing it later. My brother sure does, as it was to late for him to do it after he put it off for so long.
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