Yes, a commencement clause as described above is very good to have in a lease! In fact, I am putting one to good use right now as one of my leases is about to expire and the operator is aware of that clause and is now asking me to extend my current lease so they won’t have to pool me. I was apparently the only one of their lessors with such a clause. This gives me leverage for better terms on any extension or new lease that I am asked to sign. They also may try to just get a rig on site and drilling prior to expiration, which is fine, but we will see. I may have to send the land man up there to take a picture of the site on expiration day to verify drilling has commenced.