Pros:- 10 sizes- Nice heavy steel bits with black protective electroplating- Tungsten carbide cutting tips- Fairly long shanks- Seems to cut through concrete well, at least when new- Made for 1/4" chuck 4" hex drive , which is so handy for most cordless drills and screwdrivers as well as regular drill chucks. Cons: - Electroplated black finish will wear away on first use - Packaging will collapse leaving no place to store bits once opened - Long shank makes small bits more brittle so use of hammers should be avoided. Drills in concrete or stone never last long on me so it will be interesting to see how they hold up. Good through. He also removed the electroplating, which is not surprising. Overall though, I predict they'll hold up just as well as the cheapest bits. According to my magnet test they really do have carbide tips. I wish the packaging didn't have to break open when I opened it, otherwise there'll be a bunch of little things rattling around in your toolbox. At least give us a cheap plastic holder! I guess I just put them in a ziplock bag or something. Considering the price and my first use test I give these bits 5 stars.