Here are your questions, answered!  We started using this and it truly does last all day, even for the guys. We made it through a whole day starting with one of the hottest days of summer so far at a local market event, and we went out on another super hot day (100+) to clean out chicken coops! And no smell!
 
Is it sticky?  No
 
Does it leave a film?  A teeny, tiny bit, but nothing dramatic, and easily wiped off. I've had just as much film with regular deodorants.
 
Is it clumpy?  Not once it is evenly distributed.  Meaning, when you first put it on, it could have a couple of “clumps.”  Once you get those rubbed in so they disappear, no more clumps the rest of the day.
 
Does it work on those hot days?  Yes! (see above for a description of how we can't seem to stay out of the sunshine on those miserably hot days!)
 
Have men tried it?  Yes and they love it!  The scent is neutral for either gender.
 
Does it irritate the skin?  None of our testers had issues with it irritating.  We significantly limited the baking soda so it would be as non-irritating as possible while still being effective.  Because baking soda is a known irritant, we were cautious with how much we included.
 
Is it an antiperspirant?  No.  It will absorb some, but this is a deodorant only.  Allowing your body to perspire is actually a good thing.  Antiperspirants don’t allow for natural elimination, but we can control the odor.
 
How long does it last?  All day!
 
These are over 2.5 ounces, which is the same amount you typically get from the store.