I have a few of the NOGA offerings – the large handled kit, a large handled single unit, mainly for deburring edges, corners and sheet edges, and a mini-kit.
To be honest, I NEVER use the countersink capability – I find it awkward and an uncomfortable motion. For CSK deburring, I have some of these:


Ann I use them in a small battery powered drill – that works very well, at slow speed, and one gets the hang of it very quickly – easy to deburr a hole drilled, or apply a more prominent CSK to a tapped hole, etc.
For deburring corners of material, such a milled flat surface edges, or guillotined sheet metal edges, etc, the NOGA kits work well, but I find the long handled types uncomfortable and when doing inside curved edges for example, the need to rotate the tool in a compound fashion while sliding the cutter along the edge is uncomfortable – it requires the whole wrist and fore-arm to rotate, rather than fingers and wrist.
The Mini-Kit is my go-to deburrer ( is that a word??) – very slick to use, quick and easy. Hard to describe the uncomfortable action, but its like whittling a chicken egg sized object with a carving knife versus a penknife…
The NOGA kits I have – this one is new and used maybe a half dozen times – probably won't ever use it again…

This is just a single tool, with spare deburring blades in the handle – gets used when really heavy cuts are needed..

And my favourite: The handle is 80mm long, 16mm across flats


Joe