On the positive side, it was really easy to make (once you've got hold of the ingredients - although I could buy everything I needed from Sainsbury's). Literally just dump everything in the food processor, along with some melted butter, and process for one minute. Then bake for 35 minutes.
But it was a bit disappointing. It was lovely to have something as a carrier for Marmite, which I truly miss, but it's really not like bread. It's more like a savoury cake.
I tried toasting it, but all that it does is gets hotter rather than crisper.
I did make it with eggs smaller than he stated, (medium rather than large), so it might have risen and been a bit less dense with the right size eggs, but it was still unmistakably cake rather than bread.
However, I reckon after a couple of days, when it's staler and therefore drier, it might be better. And it would definitely work as a bread substitute for something like an open sandwich, e.g. with smoked salmon and cream cheese on the top, or smashed avocado, etc.