I've used those. I would say that they're not perfectly erasable and it still takes more effort to erase compared to a whiteboard.
I think the biggest thing here is the size of the canvas and the speed at which you can make changes. Sure, markers can be messy and smelly, I will give you that. Regarding the imprecision: when I am brainstorming I am not looking to be precise and I would argue that noone should be aiming for that; prototyping should be messy and quick to mutate.
>I would say that they're not perfectly erasable and it still takes more effort to erase compared to a whiteboard.
I think the biggest thing here is the size of the canvas and the speed at which you can make changes.
Some FriXion colors do erase less well than others.
But to address your concern about effort to erase I recommend trying a little butane torch lighter. Little puffs (quick clicks) of a lighter on the FriXion ink is very effective as an eraser. A continuous flame strafed across a page will erase large areas without damaging the paper.
While a lighter might seem a bit inconvenient its much less cumbersome than carrying around a white board and eraser.
I think the biggest thing here is the size of the canvas and the speed at which you can make changes. Sure, markers can be messy and smelly, I will give you that. Regarding the imprecision: when I am brainstorming I am not looking to be precise and I would argue that noone should be aiming for that; prototyping should be messy and quick to mutate.