For those who have never used them I would say they are great. I had to watch the video to understand how to use them because there were no instructions. I paid $10 for a similar set at a big store but it only came with 4 hole saws and no carrying case so I'd say it's great value for money. (I lost part of the drill so I bought it as a spare). Very happy with the purchase. hp I learned a valuable lesson. On veneered surfaces it is difficult to make integrity wider. You may need a helper or object to keep the saw from slipping.