Welcome desp4038, and Congrats on the purchase! This kamado is a great buy and a fantastic value for money! I got the 2020 Louisiana Grills 24 from Costco UK a couple of weeks ago. I know it differs from unit to unit, but mine has been pretty good so far. The gauge shows correct (tried it over boiling water), I haven't spotted much leak at the lower vent or around the top vent (though I still added a 2nd layer of seal there). The only little problem I spotted is that even with closed daisy wheel I can see some smoke coming out from the top. Have you experienced this? It's not a big problem as the fire dies within a couple of hours after closing the vents, and I've done only 5-6 cookings on it, so maybe after another 10 -15 cookings the patina on the top vent will thicken and this leakage will disapear.
I can't properly compare it to the last year's model, but they had two 2019 units left in Costco when I bought mine. I had a look and the hinge is a game changer for me. It feels way easier to open the lid on the newer model. The bottom vent of the older model felt a bit tighter but, as I said I haven't had many problems with mine.
Hope this helps. Enjoy it!