It hugely depends on the target user group: admins don't mind about an 'ugly looking ... but productive software', but non-IT users mind a lot, and for them it

It hugely depends on the target user group: admins don't mind about an 'ugly looking ... but productive software', but non-IT users mind a lot, and for them it has a significant effect on usability. It can only be '_very_ productive' for the target group, when it is also well-designed for them.