If you already have a Navigraph subscription for other add-ons (e.g., PMDG, Fenix, or SimBrief), adding Reality XP support takes 30 seconds and zero extra cost. In that case, the update is a no-brainer.
Reality XP (RXP) provides high-fidelity simulations of Garmin avionics, such as the GNS 430/530 and GTN 750/650, for flight simulators like X-Plane, FSX, and P3D reality xp database update
Would I recommend it? – but budget for Navigraph, and be prepared for a few extra clicks compared to modern “auto-update” add-ons. If you already have a Navigraph subscription for