OT Makita grinders.
Turbo Mini Forums

There are many differences in all name brand tools but something small like a grinder most manufacturing is done in just a few places and normally under licence , having said that I do know that the quality of parts used varies a lot ! 90% of engineering workshops will go through a 4.5" grinder in about 3-6 months and its normally brushes that go. For DIY use so to speak you can go wrong at around the £40 mark . If you use one day in day out you would want something that's less vibration and maybe lasts a bit longer .