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The present perfect can be used to refer to past events which repeatedly occur up to and including the present time, and may occur again in the future, e.g:
We've often eaten in this restaurant.
However,
Is there any difference if we use the present tense, instead?
"We often eat in this restaurant."
As far as i know and i hope i know well...we use the present perfect in the sentence ''We've often eaten in this restaurant'' because the action has been taking part since a moment in the past, until the moment you say it, in the present. We use the present in the sentence ''We often eat in this restaurant'' because you made a habit from that, it'a something general and it's not neither about the past, either about the present.
Please correct me!! i'm not a teacher...:)
The present perfect and the present 
...we use the present perfect in the sentence ''We've often eaten in this restaurant'' because the action has been taking part since a moment in the past, until the moment you say it, in the present. We use the present in the sentence ''We often eat in this restaurant'' because you made a habit from that, it'a something general and it's not neither about the past, either about the present. 
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