Has anyone gone for Shou Sugi ban cladding (Japanese burned wood)?

[Marmaladegin]

And if so, any regrets/ recommendations?

also welcome (from those who have it or not) are opinions on the look as an extension to a white 1920s house

Personally, I think it looks vile and would look even worse as an extension to a white house.

I wouldn't do it unless this is a "forever" house and you have no plans to sell. I think it might affect your re-sale price.