What benefit do we obtain from this ascension?

The benefit is twofold. For inasmuch as Jesus Christ entered heaven in our name, as He had descended for our sake, He has given us an entry, and assured us that the door, previously shut because of sin, is now open for us (Rom 6:8-11). Secondly, He appears before the face of the Father as our Intercessor and Advocate (Heb 7:25).