I edit some of the articles that get posted here. I came from a background of numerous other collectable games, so coming to competitive Pokemon in 2016 was a bit of a change. No other game had a market on premium articles. Pokemon has several.
At the time, Yugioh didn't have anything. Magic had one. Heroclix didn't have anything.
So it was something to keep in mind. And yeah, I had the same, "is it worth it?" "are the lists ACTUALLY good, or are they just half-hashed ideas and they KNOW the secret spice?" I had a bit more paranoia, but you get the picture.
If you have limited time to test, the metagame forecasts for events like Regionals are pretty accurate. I went to Dallas and followed the articles and forecasts closely and that helped give me an idea of what I should expect to see, what their builds would look like, and in what capacity throughout Day 1.
Are the deck good?
Short answer: yes
Long answer: they are good, but it REALLY helps if you also test them out to get comfortable and learn some of the ins-and-outs. Some of the decks that are pitched can have a high skill floor or a high skill ceiling. Whether you use it or go against it is up to you. But there is a great amount of detail of card choices, matchups, other options, etc. of any of the decks that are written about.
Also, the cherry on top is that PokeBeach is the only premium article site that holds a monthly tournament along with subscription
I hope this answers some questions. If I missed anything, let me know!