No low setting on this one. It's small and I just pull the trigger progressively until the plug breaks loose or the tool is running wide open. All of my plugs were pulled out a few years ago and silver anti-sieze was applied so I suspect that's why I have no problem.
The plug that came out had a MB logo so I assume it was original.
This is the driver I use:
Shop Hitachi 12-Volt 1/4-in Hex Drive Cordless Impact Driver at Lowes.com
It came as part of a kit. The price for this listing is crazy, Lowe's sells the kit (when it's available) for about $130.00
http://www.ebay.com/itm/HITACHI-12-Volt-Peak-Lithium-Ion-Combo-Kit-Drill-Diver-Impact-Driver-/291047270878?pt=Drills&hash=item43c3c4e9de