One of the things I learned while looking for appliances to put into our rental was that _every_ model from just about _every_ vendor had some negative reviews.? I don't think that comparing consumer-grade appliances to hobbyist-grade machine tools is a big stretch.? This is because both are very price-sensitive so the manufacturers have to manage their manufacturing so they can make money in the face of low profit margins.? The end result is a percentage of less than perfect items coming out of the manufacturing floor.? In those situations QC probably is a sampling process -- because time is money, and there isn't much to spare to make that profit margin.? So even "good" vendors will sometimes sell not-so-good product.
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