It may not last any longer than my HF 4" grinder(I use 4 1/2" discs) that I bought 6 years ago and use regularly . No doubt about it those things are not Snapon quality and I would not use nor recommend them for comercial use but for hobby or home shop use they can be a real bargain.
It makes no sense not to buy that kind of stuff from HF as the rental fee for a comparable tool is more than HF's regular prices, even on impact wrenches and stuff, tho there impact wrenches are over rated as to there torque.
i have one of them i paid 19.99 for i have had it for about a year now, i have a wire wheel attachment on it, and i keep it oiled and it works as good as my matco die grinder. for the money you cant beat it, even it it lasts 2 months, thats 7.00 dollars a month, i have had a few problems with some of there tools, but this one has worked great for me, mike.