In the past decade, the Sentinel-1 (S1) mission has proven to be invaluable for monitoring tropical cyclones (TCs) and conducting associated research. C-band S1 dual-polarization Synthetic Aperture Radar (SAR) have been instrumental in refining wind retrieval algorithms, especially for major category TCs. Systematic comparisons with airborne multi-frequency radiometer measurements confirm the unique ability of SAR to provide synoptic high-resolution TC characteristics, including key parameters such as such as the wind radii including the radius of maximum wind. Now integrated into operational forecasting centers, access to near real-time SAR data availability shall help improve forecasts. S1 data have also been shown to be a reference for interpreting and calibrating other satellite, in-situ measurements and algorithms. High-resolution synoptic SAR observations further enable significant advances in revealing links between the TC structure and its dynamics, inviting to more precisely infer tropical cyclone (TC) boundary layer properties, TC-generated waves, and interactions with the upper ocean. The recent increase in SAR acquisitions from multiple C-band SAR missions, combined with other observational data and numerical models, opens exciting opportunities to develop robust data-driven approaches. These advances shall support a better representation of TCs in digital twin frameworks by integrating future SAR missions, ultimately leading to more accurate predictions and a deeper understanding of these complex weather systems.