Open Question: Does it make sense to have both a HSA and FSA?

I have the option of enrolling in a high deductible health plan which offers a HSA. My company also offers the option of a FSA with other lower deductible health plans. I know the similarities and differences between a FSA and HSA. Does it make any sense to enroll in a FSA when I can get a HSA? Does it make any sense to have both?