How durable is the Robin?

I was wondering how durable and sturdy the Robin is since it is constructed out of plastic. I was looking a purchasing one for a very low price but it had a crack in the plastic from the bezel to the power button which to me would indicate the the plastic is a little fragile. I'm using a Desire HTC decide right which are mostly plastic but they are very durable. Is the Robin as durable or is it very fragile?

Thanks.

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