Seasoned mine with avocado oil in my friends outdoor kitchen. Her grill has natural gas piped right to it. Seasoned at high temp 500-550 for about 25 minutes a round. I did 5 or 6 rounds. Looked much better than stovetop method.
I've cooked quite a bit with the 27. I regularly use it for breakfast taters, sauteeing onions, bacon, and eggs. Very non stick. Enjoying the pan.
I have yet to use the 35. It'll definitely get used to roast my thanksgiving turkey.
I gave the 25 as a wedding gift. The couple that received it were delighted.