This stuff is great. There's not really much to say that hasn't already been said, but I'll share my experience of using this for about a year now --
The smell is nice, fresh, clean. The texture is like a thick paste or a soft clay, you massage it into your armpits with your fingers. It sinks in quickly, unless you are already sweating under your arms, in which case it's harder to work with (duh). This deodorant doesn't stop you from sweating, but it does stop you from smelling. It's not bulletproof like intense chemical-packed antiperspirants. You can't apply this to an already-smelly body and expect it to kill the stink. It is possible to start smelling a bit under the worst conditions, BUT - if you start off with a clean body and dry pits, work this in well, and wear clean clothes it's more than adequate to take you through normal daily sweating, which includes exercise.
The packaging in the jar does mean that if you're not careful you'll end up with deodorant cream under your fingernails; it's not a big deal, but it annoys me, so I keep a miniature plastic spoon with mine to scoop out the product. I use something like a large-ish pea size per armpit, and make sure I cover the whole armpit area while rubbing it in. You'll probably want to rinse off your fingers after applying.
This isn't really something you want to keep layering on without washing. (Maybe this should be obvious, but in case someone's wondering, I'm going to cover it ... ) If you're, for example, going camping, and you're not going to be able to wash for a week, if you just keep re-applying this you'll end up with a bit of a sticky mess. You might be better off with one of those crystal stones - I don't know, I haven't used them. I wouldn't apply Soapwalla Deodorant Cream more than about twice, maybe three times without having a shower -- which works fine for me and my life.
I haven't gotten a rash. However, I'm not an every-day armpit shaver (shudder! THAT would give me a rash!) and I prefer to shower in the evening, so that means I'm not putting deodorant straight onto just shaved armpits. Also, I do moisturize my pits when I moisturize the rest of my body (dry skin all over) since I figure just because I sweat there doesn't mean my skin isn't still dry and in need of care. So I've never found my armpits to be massively sensitive, because I don't abuse the skin too much.
Soapwalla deodorant does contain a lot of essential oils which can be irritating to some people's skin: lavender, tea tree, orange, peppermint, bergamot -- so I think if you know you're sensitive to any of these ingredients (or others in the blend!) you should use caution.
I can't really compare this to other 'natural' or nasty chemical free deodorants, because although I know I've tried some in the past, I can't remember exactly which ones, because I was never happy with them and thus returned to conventional deodorants. When I decided to try an alternative again, I did my research and chose Soapwalla based on the consistently good reviews I read - and I haven't felt the need to seek further.
(*: certified organic, +: food-grade)
Simmondsia chinensis (Jojoba) Oil*; Helianthus Annuus (Sunflower) Oil*; Rosehip Seed Oil*; Butyrospermun parkii (Shea) Butter; Corn Starch*+; Sodium Bicarbonate+; Kaolin Clay; Vegan Kosher Glycerin*+; a custom blend of essential oils, including: Lavandula Angustifolia (Lavender)*; Melaleuca Alternifolia (Tea Tree)*; Citrus Sinensis (Sweet Orange); Mentha Piperita (Peppermint)*; Citrus Aurantium Bergamia (Bergaptene-free Bergamot)*; Non-GMO Soy lecithin*+; Non-GMO Vitamin E*+.