There are various cutters on the market, in principle any bowl saver that will enable you to cut a bowl from a bowl has to be good and help preserve our wood reserves rather than leaving piles of waste wood as shavings on the floor. I personally consider that McNaughton are the best cutters, no they are not cheap but as with all things ‘you gets what you pay for’. I will most probably still be using mine for years and years to come, and you only have to look at them to know that they will never wear out. If you do enough turning and can justify the cost then definitely buy some but be prepared to struggle a little initially, once you have used them a few times you will soon become proficient.