oh yes, cheap tools can be HELLA dangerous!
small cheap tools are usually ok though. i bought this little grinder for less than 20€ http://www.amazon.de/Schleifer-Schl...../dp/B000QS6O3I
and it works really well!
on the other hand your video is also doing a great job at demonstrating that where is smoke there is also indeed fire, or at least the fire is soon to follow :V

I'm not saying all cheap tools are bad! I have a $15 heat gun that has yet to failed me in once in 7 years of hard use! I have seen a few grinders like that. I imagine they would be grate for engraving!

its not exactly an accurate tool so i mainly use for simulating some damage in my models.

Thats cool! How well does it work?