The evidence based on my personal video hits over the years would suggest Production companies don't generally view showreels when searching on TM? When I am hiring, I do tend to watch, but only after I have narrowed down the potential field. Of course its easy with good editing to create a false impression and showreels are unsuitable for highlighting long form narrative skills. As an SP/D a whole show is usually preferable. I'd love to know what other people & companies think.