This has always been my biggest complaint with these spells. All your class abilities, etc, and finally the biggest chunk of dam-redux, and now you can't even dispel them? Sleeks are already lvl 60 spells so would be difficult to dispel (even lvl 51 + spellcraft I don't think would reach 60), not to mention your sleek wand at lvl 40ish.

Obviously, it would probably make a noticable shift definitely in mage vs. mage fights, but I never have understood why these three most coveted spells can't be dispelled.