Dark Dragon said:
Following the Dispel Magic version from the SRD, you're wrong:
[...]
The boots don't cast Haste, they create an effect similar to it...
However, the PHB _also_ says "dispel magic can dispel (but not counter) the ongoing effects of supernatural abilities as well as spells". Now if you look at the possible ways in which you can use dispel magic (targeted, area effect, or counterspell), none of these explicitly mention supernatural effects. There are thus two possible conclusions:
1) the spell actually doesn't work on supernatural effects at all, the bit to the contrary notwithstanding; or
2) the spell does work, but they forgot to mention supernatural effects when describing targeted and area dispels.
Given that the DMG also explicitly says supernatural effects can be dispelled (see the errata), I'm inclined to go with 2).
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