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I did some work for them, so just a very few short remarks. Their goal is to collect observations and actually that's all. They started off as a birding group, which one can still tell. But to check out the observations reported, they need experts. But the observations are numerous, the observers are very diverse what their knowledge is concerned, making corresponding with them not always as easy as can be. On the other hand all these observations are valuable and it is up to each and every scientist to interpret them.

But, yes they still lack some expertise. Mark van Veen is an excellent dipterist, but he's no specialist on all families. And except for syrphids he's on his own. The same goes for some other groups of animals (bees, wasps, aphids, spiders). Concerning some other groups though I think they are quite reliable: birds, butterflies, plants and moths for instance.

And by the way I find the information on flies on the internet to be mediocre at best most of the times (except for this site, of course ;)

Cheers,

Hans