Well, using the native UI Look 'n Feel has its own advantage
1. People already know how to UI is going to work. They are already used to the UX also.
2. The default controls also make an impact on the UI & UX. Most prefer them.
If you are not going to create anything innovative or out of the box, that might create a buzz in the App Market, or if you don't have the time and money to invest into its development and innovation, i would ask you to stick to the basics and get it right.
If you try something different, you might hit a lot of critics on the way,which might make it a win or lose situation for your App. If your willing to risk it, go ahead with it.
More info on all these things at : UX Magazine
Hope my inputs are useful.