First off, I should warn you that this example is fairly simplistic and there are plenty of exceptions to the rules we'll be talking about (think of decks like Belcher in Legacy that only play a single land)
YCS Kansas City, the first major event following that structure decks release, saw it take three spots in the top 32, and the deck became a major force in the meta going forwards, but it struggled to top events like some other GX decks mentioned here
Do remember that Parallel City and AZ are potential ways for your opponent to remove GX Pokmon from the field, so try to have a backup plan in case they are able to do so
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