I just bought a set of these because I've been borrowing a co-workers for a while now. I primarily use the #1 size to remove tiny button head stainless screws that other co-workers strip out. Just jam the extractor side in and reverse it out, works every time. Have never even had to use the drill side of the extractor. Glad to have my own set now.
It is a good product that works well once you can figure it out. I used the second bit the most so it tends to wear out quickly. Overall it is a great product.