After I read all Rezesionen here have advised me with my screwdriver Forum, I've decided to Mauk preferred a cheaper. The advantages of the enclosed power nuts, the adjustable torque and that he is not equal to at full speed, the screws are furled wrong, we were worth the higher price. Q. He also makes the 500 Nm release torque and 350 Nm torque? Answer: probably less. Also, the adjustable torque does not apply to left-hand thread bolts. because he always brings to the full force. When unpacking, I got first a shock because of the size and the weight. A giant, heavy and clunky, what the "weight" falls when working with both hands, which I would strongly recommend that no longer really. Working: Studs, I did not get solved with a 60cm extension and my body weight bouncing, a time he rattled down effortlessly. WOW! However, some studs gave him "unsolvable" problems. When I then set torque wrench, but these were only moderately weightless, but offered to constant resistance by old sticky zinc fat. Here he had to chatter until he had it out after dissolving a little while. The screw in the bolts is some emotion thing is by the low starting speed is not a big problem. The torque he holds a to about 80%. It is advisable to wear with less and to set the torque wrench again. The rocker switch is not practical. To loosen the bolts it must be operated above. However, since the other fingers must firstly keep the weight with, pressing the switch automantisch simultaneously downwards, which then mutually cancels itself and will cause it sometimes almost stops. Here should be a better system to be developed, such as that of a cordless screwdriver, for example. Conclusion: It is a great help, despite the weight and size. Cycling and torque wrench + extension and WD40 should still have at hand.