I've used it so far for computer equipment, (trouser) belts that had tiny screws, and watch repair (for replacing a battery).  The latter usage saved me time and money needing to go to a watch shop.  The screwdrivers have a somewhat strange design--the knob at the very top can rotate 360 degrees to no apparent benefit and the bottom bits will sometimes fall out of the assembly and need to be screwed back into place.  But the bits have not worn down and they are small enough to work well with watches.  Overall I'm quite happy with the purchase.