These are the features listed on the subscriptions page:
" * Get up to 120 Deviations per page when browsing
* Browse with No Ads
* Browse Way Back all the way to 2000
* Customize 20 slots on your front page
* Download art to your Mobile Phone with deviantMOBILE(1)
* Make journals with Polls, Forum, Shoutbox, and even CSS"
$4.95 for a month, $7.95 for three months, or $29.95 for a year... I certainly wouldn't shell out money for such features when I have my very own website to customize ;)