It all depends greatly on your knowledge of what the K-1 represents for your situation and whether you are more comfortable with waiting for the final version or filing an amended return.
If it represents a significant portion of your income and deductions, you should use the draft K-1 to estimate your refund or balance due. This information will be needed if you file an extension because the extension only extends the time to file your return, not the time to pay any balance due amounts.
If it does not represent a significant portion of your income and deductions, then filing your return with the draft version of the K-1 may not pose a large risk. When the final K-1 is issued, you can then amend your return to make any changes in the K-1 from the draft to the final version. Such changes may or may not affect your tax return in such a way that an amended return is actually required.
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