yes the thin cutoff abrasive wheels do cut faster,but i do metal scraping in the USA,and i ,like some scrappers and plenty of other people have more time than money ,for me the diamond wheels are they way to go, no worries about wheels braking up and throwing pieces all over,,and u just get more cuts from the diamond wheel, however, i was using one to cut up some welded angle iron and channel and the diamond wheel binded up in the cut more than did the abrasive wheel,,just something to be aware of..these diamond wheel are now made in the USA,south korea,and china..dont know which is better..