So, how well does it work, you say? I think it works better than the Toms of Maine apricot-scented deodorant that I had been using, which claims that it is effective for 24 hours. At the end of the day, I still smell like a clean human. It does deodorize. It doesn't mask a bad scent with a good one. It is important that I point out that I don't sweat a lot, even when I am running or swimming laps and I also usually don't smell all that bad even when I do sweat (unless I am wearing poly on a hiking/camping trip - that's the exception not the rule). One other benefit to using baking soda is that it doesn't ever burn or itch when applied to shaved pits. I haven't had any staining on my clothing and when I wear black tank tops I check the arm holes and have never noticed any white residue.
Baking soda is not an anti-perspirant, so you will still perspire. It does not contain cancer-causing aluminum or other harmful metals or chemicals. I am still looking for a good way to make it portable. Right now my bowl system isn't convenient to take to the pool or on an overnight trip, simply because a bowl is too bulky for my toiletries bag.
I have found that baking soda works best as a preventative measure, rather than applying it when I *notice* I need it.