Automatic updates
Realistic stall speeds & behavior
VR Support
100% custom engine model independent from X-Plane default
Realistic Landing Gear
Electrical & Avionics System
Learn with the non invasive in-flight tips
Simulation of Hypoxia
3D sounds (custom FMOD-like sound engine)
Interactive Walkaround
Interactive towing
Weight & Balance Tool
Popup Kneeboard
Simulation state saving
Maintenance Hangar
HeadShake Integration
Avionics
Very easy on FPS
More pictures here