I don't see any reason for flames. Based on the opinions given and the work Philbert did, it sounds like a cheap HF grinder plus a sufficiently skilled operator will yield a reasonably sharp chain. However, it does require the user to know what they are doing, the grinder doesn't have a lot of HP, and the wheels are an odd size. The HF grinder is going to be a bit slow if you're trying to do more than one or two chains at a time, and it requires more skill to get acceptable results. That's not going to be a good match for my potential application.