Sequential shift also known as “Tiptronic-style” automatic. Although the name sounds fancy it is simply an automatic transmission with the ability for the driver to change gears up or down (without a clutch) as desired. It is not a clutchless manual, which dispenses with a clutch pedal (the clutch is controlled electronically) but in most other respects it operates as a manual transmission.
The Advantages for a Sequential shift:
It is quicker. For example, to go from 2nd to 3rd gear in a manul gearbox using the “H” pattern, the driver has to push the lever up, over and up again. Which takes a great deal more time then simply pushing the lever up
It is the same motion to change every gear up, or down.
Hard to cause engine and gearbox damage by putting the car into the wrong gear.
The Disadvantages for a Sequential shift:
Doesn’t feel like a manual
Not as fun (but we are just splitting hairs here)
The Majority of race cars (for example Formula 1) use this type of transmission. A great deal of everyday sports (Porsche) cars also use this type of transmission.