Is it worth to replace the Fuze stock ear phones with expensive ones?

@jk98 wrote:
There are some good inexpensive earphones such as the Sennheiser MX400 that cost only around $10 or so. The Sennheiser CX300 at under $30 is a good value. The problem with isolating earphones is that they block outside sound. While this might be good in some circumstances, it might be dangerous in others.

So are earbuds like the Sennheiser MX400 good as the Sennheiser CX300 Canal Phones?  I wanna listen to something that makes me say “WOW!” compared to the standard earbuds that come with the Sansa Fuze.