The SOLar-STellar Irradiance Comparison Experiment (SOLSTICE) onboard the Solar Radiation and Climate Experiment (SORCE) made measurements of ultraviolet solar spectral irradiance (SSI) from 2003 to 2020. This seventeen year SSI record includes the decline of solar cycle 23 and the full solar cycle 24. We will present an overview of the in-flight calibration of SOLSTICE, and the solar variability results from the final data release (version 18). Absolute calibration results agree with the Total and Spectral Solar Irradiance Sensor (TSIS-1) within 5% throughout the 200-300 nm overlap region. Comparison to the SATIRE-S irradiance model shows good agreement up to 260 nm. The version 18 data products not only include improved calibration algorithms, but also include the full 0.1 nm spectral resolution and a high-cadence Lyman alpha product.