While this show carries the Tim & Eric torch of whacky, surrealist humour in 'late night broadcasting' format, it differs greatly from the rest of their work, and holds the position for the scariest thing they've ever made.
At the start of the show the tone is fairly bright and upbeat, but as the episodes pass, everything starts going wrong. Brule's brain damage worsens, several dark characters appear seeking to harm Brule, the topic of each 'Check it Out' becomes more sinister, and evil supernatural presences begin to affect the show itself.
Anyone who enjoyed Tom Goes to The Mayor will like this show, as it has a very similar dark tone, and even similar disgusting products & advertisements.
If I had to classify Check It Out, I would call it a very funny horror, rather than a very scary comedy. The tone is just too consistently dread-inducing to be called otherwise. But it very much works in its favour, and despite being extremely uncomfortable to watch, it was absolutely worth my time. I'm excited, and a little nervous, to rewatch it again in the near future.
