With changes varying from speed, range, power, the number of hits and other properties, Enhanced Special Moves have many advantages in comparison to their standard counterparts as a result of using a portion of the Super Meter.
Prior to the inclusion of these moves, fighting games like Super Street Fighter II Turbo only allowed players to spend their super meter all at once on a Super Combo, while Special Moves and Normals can be accessed at no cost.
Hence, Enhanced Special Moves had many implications when introduced to the Street Fighter series with Street Fighter III: 2nd Impact. This was due to how an EX special for many characters could also warrant similar caution to when someone has a full super meter.
To compensate for this, many games have the character using the EX Move flash when the move is being performed and have a dedicated sound to draw attention to it. This can be seen in the above screenshot showing Kyo having a blue trail when doing his EX uppercut.
In the Street Fighter games by pressing multiple buttons at once with most special moves, due to how all six buttons were already used for special moves of Light, Medium and Heavy variants of punches and kicks. This can allow for four variants of a special move (or more if it depends on which two buttons are pressed). Some games like Dragon Ball FighterZ use a dedicated button with commands for EX Moves.