Yes, maybe straight grain dowels are a bit overrated. I built plenty of projects with the dowelmax and store-bought dowels (which I believe are not necessarily straight grain), and they all held up very well.
I use the Lie-Nielsen dowel plate, it was a gift. I use it when I want to have exposed dowels, and when I care about the color of the dowels... e.g. for a nice contrasting little effect.
The Lie-Nielsen plate is not ideal I have to say though. There is really one whole missing between... somewhere... I forgot. But it becomes really hard at some point to get the dowel through. And it's a bit of work to make e.g. 12 dowels. Yet the results are rewarding.