This is a great addition to the Masterbuilt smoker range of accessories available to the 40" Gen 2 smokers.
The Masterbuilt Gen 2 Electric Smoker has a completely flat top where the controller is now on the front and the damper is on the side which frees the top up for putting things on, but when you add the fold up shelf it opens it up to a massive space that gives you somewhere to put your meat, woods and tools. It is a great and convenient addition to your smoking set up!
This shelf is designed to be attached using the handle and door hinge fitting points, so it is specific to the Gen 2, however with a little bit of modification you can attach it to the Gen 1 smoker too, but you will need to drill a hole in the front corner. There is a video on You Tube where someone has done just this.