I used this to break some holes in the bottom of an in ground pool. Took about 2 hours per 2 ft diameter hole. Use the chisel bit. Don't hammer for long stretches at a time and keep the duty cycle low and use a big gauge extension cord and it will last. Enjoy!
I bought this to help remodel a house and it has worked great. We had to remove part of the concrete floor to repair some plumbing and this was much easier to maneuver than a full sized jackhammer but just as quick.
This is my first time owning an electric jack hammer and it does exactly what I need it so do. The only issue is that it's not ready to use out of the box because 30 weight oil is needed to fill up the reservoir and it doesn't come provided.