I have both and too many. If I didn't respect Clarks I'd hang from others. I've described elsewhere a value added pricing model. IMO, the additional area of ventilation in my Tropical from the noseeum is minimal, but I can understand Clark including as a feature.
The issue, which calls for measurement, is how much air gets through the close weave of Clark's no-seeum, and even how much the temperature goes up inside from lack of air flow. I'm sure bugs can't get through. And I appreciate that rather than just spanning the zippers with seamless netting, Clark creates sewn-over gathers, a rough grid, which provides stability some maker do not, and even defined smaller areas for replacement should there be considerable local tearing.
I want to have the $ courage to replace a pair of those panels with coarser, insecticide and repellent-infused coarser bug netting, to see if in really hot weather the air flow cannot be increased. But, the head-net? I would value it more if I could find a reason to deploy the optional weathershield over my body, but then not prefer some DWR protection over my head as well.
On Clark hoods: Thumbs up for a feeling of protection without any real enclosure. Great for stowage too, with added loops.