I used https://www.freetaxusa.com/ and it was fantastic. The interface is a little bit clunky, but the value is there. They charge $7 for "deluxe support" which was easily the best $7 I can remember spending.
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Edit: re-reading this comment I see how it reads very much like I'm making the whole thing up and shilling for Free Tax USA, so some more detail on the CK incorrect behavior I experienced -- CK kept listing my K-1 partnership income as income from rental properties, which in turn caused the interface to be broken if I tried to click into the rental properties section where it valiantly tried to show me the zero rental properties that contributed to the number from my partnership income. I contacted support, and they told me they didn't support K1 partnership income. I asked what it meant to not support K1 partnership income if they had K1 partnership forms to fill out. They said they'd get back to me by email. They emailed me a few days later (after the filing deadline) with a generic link to partnership income documentation. By then I had already filed with Free Tax USA.