Well, to start with, if they are roasting on a George Foreman grill, they would fall into the amatuer category.
Quality is the key and typically in the tastebuds of the beholder. I won't even get started on Starbucks! But you might look at their distribution - if you find they have a good customer base and people are satisfied with their product, then what more do you need?
Stability vs Struggling? So, you want a quality coffee roaster that is also a good business person? See above. I would rule out size, though, as small doesn't mean bad or unstable. When my father was a small boy, he and Grandma would go down the street to the neighbor's house on Saturday morning to buy their coffee. "Mr. Cap" as he was known, roasted in his garage! Usually he roasted enough coffee to supply his store - the Community Mercantile in Baton Rouge. Mr. Cap Saurage founded that store in 1919 and today Community Coffee is all over the planet. You never know. I sure downed a lot of it when I was at LSU! (Usually on Saturday mornings, but that's a twisted story for another time.)
You spelled "beginner" wrong, but then we were all "begginers" with that once. Sorry, some of us roasters pay attention to the details!
Your profile doesn't give us much to go on. What area are you in? We can direct you to some roasters worth trying if you give us a little more information.
In any case, good luck.