I have extraordinarily sweaty fingers/hands and most chalk I've used has not helped in the slightest with that particular issue. Magdust not only feels better on the holds, be it slopers or crimps, is actually also makes my hands feel less sweaty, which is for me an unforseen bonus.
Obviously you can't expect to just stick on to every surface you hold, especially not if you're new to climbing/bouldering. But this will help make it easier.
The chalk feels great to the touch and I often end up using more than necessary because I just like touching it. Keep in mind if you start using Magchalk, it'll be difficult to go back