I'm definitely of the camp that if you are wearing a tartan, you need a sporran. I couldn't live with out all the junk I carry, and I think they look a little odd without a sporran. As others have said, the Freelander is the way to go for every day wear as it holds a ton of stuff. I do have a couple of dressier ones, but I've even gotten to the point of using the Freelander unless I am completely decked out formally (and then the irony is that my dress sporan was cheaper than the Freelander).

Adam