Different airlines have different guidelines. Its often worth looking them up.
When we flew from Sydney - Japan by JAL it was a straight 20kg weight limit, we just took our board bags to a different "oversize" counter, it wasn't specifically classed as sporting goods for us, just oversize.
I too have also been considering a bag/sleeve for my snowboard gear. Like most of you guys, my friend has made due w/ some cruddy zip bag that he just stuffs w/ all his sweaters, towels and outwear for protection. He seems to have done fine going that route. With that being said...will something like the Bakoda Padded w/ wheels bag be overkill and too heavy?