Round waste tank

I'm thinking about purchasing a round waste tank. I know it would free up some space in my trailer. I was just curious if it would increase/decrease air flow or if it would have any more negative/positive effects. What do you guys think? Anyone on here using a round tank? I am currently using a 100 gallon rectangle tank now.
http://www.cobbcarpet.com/zen/index.php?main_page=product_info&cPath=72&products_id=5048