I got one of the Aldi grinders but I broke the spindle lock within days. It could have been nasty if the thing had fallen into the mechanism at those speeds!. You could say it was from over tightening the spindle nut and consequently over stressing the spindle locking mechanism, but I've had other of these cheap tools fail in similar ways: Basically the low melt alloy they cast these from is too feeble. It's really easy to strip threads cut into it - as you do a screw up there's no point at which it feels tight to indicate that further tightening will strip the thread - really you need to under tighten to be on the safe side. The other thing is the grinders really noisy! I've not used an angle grinder before so I can't compare it to others but you really need ear protection and friendly neighbours! A nice cheap tool to learn angle grinders on though!