I know this is a dupe for SKII but I've never tried it before so I can't compare. However, this brightens up and tones my skin so nicely. I use it straight after cleansing and toning and before putting on my serums, actives and moisturiser. I can see the difference within two days. The liquid comes out in drops due to a stopper so you can control how much of it to use. I think it'll last a really long time and I'm really happy with it.