I’ve got the 710mm flats on my 29er. Really nicely made bars but I was disappointed that they were 220g instead of the specified 177g – quite a big increase but at the time I couldn’t find any other >700mm flat carbon bars. Getting used to quoted weights being well off these days so kept them as at least I know they should be strong!
I did notice that carbon cycles have some even wider flat bars that are quoted as being sub 200g which look nice but quite a low sweep and I like at least 8deg and the X-lite are like my Easton bars which are 9deg.