Works great, solid consistent feel easier than a torque wrench.
Con: Bits fall out of handle easy, makes a big swing when it clicks free so make sure your fingers are clear of anything
Has the size Allen wrenches needed for most bike bolts and is easy to use. Simple to change sizes and on board storage. Less expensive than torque wrench but does most of what you'd need a wrench to do. Gives you the assurance that your components are correctly and safely tightened in place.