Bought for me and my son-in-law. We had a lot of fun and the normal learning curve collapses. This machine is quite a performer. You should be careful which sensitivity setting you choose. 20% is enough for the room. After hitting a post and falling 15 feet to the tile floor, I finally snapped a wire near the motor. The block is easy to disassemble so you can do solder repairs. Don't look for much help in the guide unless you like broken English and fancy sentences.