The highlighted features are:

Clone Stamp tool allow you to fix stains, scratches and much more.
Professional Level Adjustment tool.
Automatic one-click White-Balance.
USM Sharpen makes photo sharpen without more noises.
Various Marquee Selection Tools.
Feathering feature can soften the edges.
Fast Undo/Redo operation.
Dodge/Burn tool is useful to adjust brightness of a portion.
No EXIF metadata will be lost after saving.
And much more...