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It's a solution of sucrolose, which is functionally different than EM or any of EM's branded names. Sucrolose is an actual sweetener (and will gunk up coils faster as a result) while EM changes your taste buds' impression of sweetness to a small degree and affects how the other flavorings expresses themselves (tends to mute flavors at too high a concentration, for example).
Some pertinent info. I've never tried using sucralose. Have you ever used liquid stevia? If so, how would sucralose stack up against it?
What CloudAlchemist said - I'd only add that it is much sweeter, too. Sucralose is super sweet and I find that 1 drop per 10ml is pretty impressively sweet.