Seen this tool while in one of my local auto parts stores. Decided to give it a go. Here's what I found.
Pros:
Very slim head to fit in tight places, especially with low profile sockets.
Switch isn't easily knocked back the other way.
Sturdy feel.
Cons:
Handle doesn't feel comfortable.
Not enough teeth in the gear.
Needs to be a bit longer for better leverage.
Overall, for $20, it's worth adding to the drawer. For me, the clunkiness from the lack of teeth is the biggest drawback.