The TS808DX was released in 2014 to celebrate the 35th anniversary of the original Tubescreamer. Whats great about this pedal is the boost circuit can be placed pre or post in order to give the player a volume boost in post for lead work or in pre it will push more signal into the Tubescreamer circuit which pushes overdrive into the realm of distortion.
The Tubescreamer circuit even uses the iconic JRC4558D chip seen in the early pedals. The boost side of the pedal can be used independently allowing you to boost other pedals in your chain or simply to provide a clean boost.