I have a 6"Skil bench grinder (paid $30) that is 36 years old and starting to get death rattles now. Respect. If you 'let the machine do ït's job', they go for a long time.
“The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory.”
This is old school thinking, as you should buy the quality that you will need. These days we are spoilt for choice, Ozito for once off jobs, Ryobi for the home handyman and Makita for the professional. And don't buy something that will outlast you.
Cheers TC