I have several sets like that. Bought over the years from this shop and that. Lately mainly Lidl and Aldi. They are all the same quality and work perfectly. I am a professional model
maker, so I've put these things through the mill over time and never had any complaints. I tend to use my Proxxon drill
, which is always flat out as the electronic speed control packed up so I wired it straight through. That might explain why the drum sanders struggle a bit sometimes. I now use them on a drill
with a lower speed capability and they're doing better. Grinders never last long, so it's as well to have as many as you can gather. I think the fact is, these tools
are only likely to be made by one or two companies, so all are as good as each other. And they come in such NICE boxes!