My own personal preference is unless it's under say 30 bucks, I don't buy electrical tools, that I may put a lot of time on at Harbor Frieght. I have a 5" sander from Harbor Frieght, and it's a few years old and it gets used alot. But personally, I don't think I'd buy a bench grinder, that I plan on using a lot, from HF. I would go to Home Depot or Lowes. I know some of there's are only a few steps better. Myself, I have an 8" Baldor grinder. Now this is a 600 dollar grinder, that I would have never bought myself. It was given to me, brand new. My father-in-law worked for a company who bought it by mistake (my father-in-law wanted a 6" one) and he worked for a huge company who thought it to be bothersome to ship it back, so they bought him a smaller one and told him he could do whatever he wanted with the big one. Well, I had my own business at the time, fixing metal cutting machines, so he gave it to me. This sucker will get passed down some generations, you can bank on that. It's about 15 years old now, and it looks and runs like new. Quiet as a mouse. I also have a 6 inch craftsman, that was also given to me, but it was used. I've had it for about 30 years, and I bet it was 10-15 years old when I got it. And it too still runs like a champ. I'ts set up for buffing.
I know you don't want to spend 600 bucks on a grinder, no way would I either. But if it were me, and I planned on using this tool, more then occasionally, I'd pay a little more for a little better grinder. Again, that's just me....