Didn't expect much, but got a lot, read manual, added oil and then used, broke through quite easily on 4" concrete with rebar enforcement. Used 2nd bit to free first bit, due to quickly breaking through slab and wedging at times, have lots of muscle, wear hearing, eye and very well padded gloves.
trigger sticks when using but did OK with what I needed
while operating, the trigger would stick, hammer kept hammering had to press the trigger several times to get it to stop, other than that it did OK, good buy for the price. goggles, gloves earplugs all included