Excellent product for someone needing light to medium protection, as the previous poster mentioned. I wouldn't recommend it to a construction worker, but for someone with an office job, it is gentle on sensitive skin, and lasts forever. I have had mine for a year and a half (using it 95% of the time, and saving my Ombra deodorant for when it's really hot in our airconditionerless apartment), and I haven't even turned it once.
The downside is that sometimes the crystals can leave a fine powder in your cupboard, and it has to be wet before use, which could be inconvenient for some people. Otherwise, I love it for regular use. Chemical free for my sensitive skin, and very economical.