G'day Tyson,

The Aeropress & Aeropress Go have exactly the same end cap, so the stainless steel reusable disk will work with both.
Hope that helps!

G'day Bea,

The official word from Aeropress is to use an Espresso grind, which is generally fairly fine, this is best suited to the standard press method. Generally, with the inversion method, you'd use a Medium-Fine or Medium grind and leave it to brew for a few minutes before pressing. Personally, I use the inversion method with a Medium-Fine grind most of the time.

G'day Jo,

Yes the Aeropress Go has a slightly smaller capacity, it has three quarters of the capacity, and goes to the number 3 on the chamber, the original goes up to the number 4.

She is making coffee using the 'inverted' method, Sushovan. This is a commonly used method but Aeropress don't recommend it as the unit becomes top-heavy and there is an increased risk of spilling hot water. 

You can use this inverted method if you have a stable spot to stand the unit, and using this method can make a stronger coffee as the water does not immediately start to filter through. Instead, you are getting full immersion of the coffee grounds for as long as you want, so you can make a strong brew.