i used this for breaking through my basement floor to repair some plumbing. i appreciated the globes, eye protection and the mask, as well as the little top up of grease. It's a great kit, and a great tool. I dont know if its contractor grade, I'd rather buy 6 of these than 1 milwaukee. I had never used a tool like this so it took me awhile to get the hang of it, also a basement floor is much more difficult than an exposed pad or curb or something outside. the two bits included have specific advantages in their use that quickly become apparent. its quite significant that you only need to apply enough pressure to keep the tool under control, not force it forward. also hold it straight on, dont hold it at an angle for most work. just imagine if it skipped and hit your shin, after you see it devastate concrete. i prefer the bull point to break into hte concrete then the chisel in between the holes the bull point creates to fracture, this was much faster than drilling holes to control the break. i dont have a saw to cut an outline so i used a rotary hammer drill to make 5-6 holes in the corners and a few holes about 3 inches apart on my outline. this worked really well to control the fractures although i dont know if it was necessary. its the perfect size for me and my small project. if i had to tear up an entire basement i would get a bigger unit. i can use it for about an hour of continuous work before the collar is hot to the touch and the grease begins to look thin. at that point i let it rest until the collar is cold to the touch. by collar i mean the square box just behind the bit. the grease bowl on top seems industry standard, awkward but not challenging. the bit come in plastic sleeves and oiled. i dont know what kind of oil but handy little sleeves. the bits are quite durable although the bull point is noticeably shorter when i was done, i guess showing i relied on it heavily. the bits can be filed to something of a point. this is helpful when
Jason S. Cooper 
