What is Reddit's opinion of De Buyer - 5110.30 - 'Carbon Plus' Round Stove Lyonnaise Cup - Tail Feather Riveted - White Steel Sheet?

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Sure. They are, as the name suggests, a French company who have been in the cookware business for Some Time (oh. I just checked their webpage and it's only since 1830.. still)

They have a number of carbon steel ranges: Lyonnaise, Force Blue, Carbone Plus and Mineral B. These range in thickness from 1, 2, 2.5 and 3mm (I think). The Mineral B has some sort of coating which everyone washes off and seasons normally. I have a 30cm Carbone Plus and it weighs a shade over 2Kg.

The advantages over CI is that the steel pans are forged/machined rather than cast. That means the interior surface is dead flat, not a bit bobbly like a cast metal would be. That makes seasoning easier and quicker. Old iron pans used to be polished smooth before sale but they're often not these days. Personally I much prefer DeBuyer's handles to the little ones you get on most CI pans, but that's just my preference.

I'm told that, for the same area of pan, carbon steel is lighter than CI, but I don't have anything of the same size to compare. 2.5mm steel is thinner than the CI pans I do have, so it would make sense it's less weighty. It still retains heat like crazy, so that's OK, and I can just toss a 2Kg pan full of food, I'm not sure I could do that with anything much heavier. Again, could just be me.

DeBuyer's webpage is here, but it's not exactly packed with information. Plus they do keep using 'iron' rather than 'steel' and it's definitely not iron. Chowhound has a fairly long thread on them here

Hope that's useful!