They are worth it, they don't cost much. I bought them in the second half of 2007. They were quite expensive compared to others, but I avoided the obligatory annual replacement of the "cheap" ones, which even if they cost €5, would have been more expensive. Since they are still like new even now, you can use them in the next one or give them away if you switch to ... rollerblades, due to the skyrocketing fuel prices, or anything else