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Hovis-
Probably as good as you are going to get at the price, unless you go for grind stones instead.
https://www.amazon.co.uk/MOUNTED-CYLINDER-GRINDING-ABRASIVE-DREMEL/dp/B072WBMMF9/ref=sr_1_1?s=diy&ie=UTF8&qid=1510421562&sr=1-1&keywords=rotary+grind+stone+dremel
freezing77
If you do use a rotary burr, try to get a fine one as opposed to coarse, takes longer to remove material but less prone to jumping and "chattering".