I understand the idea of the bottom-mounted PSU, it just doesn’t look right to me yet. Though as Greeny mentioned, my first computer was horizontal with the monitor sitting on top, and it took me awhile to get used to vertical standing cases.
Though, now that you mention it, why is it better that the mobo, CPU, and RAM sit at the top and get all of the heat rather than the PSU? I’d think the cheaper part would be better able to withstand the heat.