Most socket spinners (do you love ’em or hate ’em?) have straight shafts and are designed to be used in the same manner as a screwdriver. The Facom 1/4″ drive R.142 hinged handle driver is half socket spinner, half T-handle driver, half stubby breaker bar.
I think I can see the appeal of this drive accessory. Straighten the shaft for fast spinning, bend it at a right angle for higher torque applications, or use it at an angle to help access fasteners in tight spaces.
To be honest, despite the slight appeal, I wonder if this is an answer to a problem most industrial users, professional auto maintenance workers, and home mechanics don’t have. I think I would be much more confident about this tool if the hinged joint had a locking mechanism to keep the pivot set to the desired angle, or at least at 0° and 90°.
If the hinged handle strikes your fancy, the price is reasonable – $26 at Stanley Supply as a special order item, and $34 at the Ultimate Garage.