@folobatuyi: I have been using the crystal. I just don't like the sticky film that never comes off and enlarges my follicles. Also, I'm sensitive to chemicals, and the crystal has absolutely NO smell whatsoever. For the stick deo/antiperspirant, even the unscented variety has a smell to it.
But, this will be my first full summer in Houston, so round about August the tale will be told.
@Khalliqa: I never thought of using tea tree under my arms. That sounds like a good idea. I've only been using it on my scalp and locs. I typically mix it with some almond, rosemary, and sage.