If you want to be precise with a dremel you need to buy it
If you wanna be precise with holes and dremels, you need it. I used to make 0.5mm holes for electronic components and it saved my life. Yeah i know it's expensive but you buy it once in a lifetime. Just a side note: if you also need to drill 0.5mm hole don't buy dremel's tips set, the 0.5mm tip breaks just by looking at it. Buy the dremel chuck and the 0.5mm tips from proxxon, cheaper and WAY better. You'll thank me and send me a vegan panettone for christmas, you're welcome.
Easy to set up and quite light
Expensive but you can't live without it. Like a girlfriend