Oh yeah the salt crystal ones are superb.
When I first looked I couldn't find a 'normal' looking one they all looked like stones... or something... but now they are packaged to look like regular deodorants - I know, excess plastic packaging, but at least you don't look like a weirdo, plus it is easier to make the transition, cause it looks similar to the thing you used to use.
I would definitely say that it helps reduce your sweaty betty levels. I maybe apply every 4 days now, perhaps more in really hot weather, if I am doing sweaty chores. Some times, with mitchum mens extra strength I would be a twice a day girl

and I was still sticky.