Never experienced any of these. Why are you choosing to fixate on this one particular review? Always consider the source and corroborate. In this particular case, the pros and cons section is a section where anyone can add a pro or con. Note that the site itself is named ProductWiki. Wikis tend to come with a huge caveat given their nature. No telling. There's no way to know who made that comment and you'd have to ask that person. We have no idea how the person made the assessment, what equipment was used, how the equipment was connected or how the picture quality was compared. It's certainly possible that the external tuner used did have better picture quality. It's also possible that the person arbitrarily decided that the external tuner was better for some reason or for some preference that others might not share with that person. Some people like enhanced sharpness, for example while others don't care for it. That's just one example and there are a number of factors that can affect image quality. There are any number of other reasons why this conclusion could have been incorrectly reached. It's anyone's guess with this review and there's no way that I know of to verify or really to dig into it. I'd mark this review as dubious and wouldn't even seriously factor it in to my decision making but you're certainly welcome to use it if you think it's relevant. If you're sure of these things then I'm not sure why you're asking us. Use whatever method you used to verify the testing process that the commenter used. I wouldn't recommend assuming anything -- especially when evaluating a review like this.