Need advice on Diamondback

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Anyone familiar with Diamondback Response Sport or Sorrento? I currently have a ladies style Diamondback Topanga, about 16 years old, wanting to upgrade, and am trying to make a decision between the above 2 styles. I like to ride in the dirt and rocks as well as the street, so the sturdiness of the Response appeals to me. Want something sturdy, comfortable, reliable (I'm mechanically challenged) but not so flashy to attract thieves. Would appreciate some input from anyone familiar with Diamondback to help me with this decision.