I have tried all the clinical deodorants because on a hot summer's day, nothing else will do, and Rexona would be one of the top performers.
First off, yes clinical deodorants are expensive and for a long time I was skeptical about spending that much on deodorant. But if you do need something with a bit more kick, whether it's all year round or just when you're at your sweatiest; I would recommend giving clinical protection a go (if you want for a good special you might be able to score it for about $10).
It is not the be all and end all by any means, but it does provide some longer lasting relief.
My biggest bugbear is that for the price, you seem to go through it very quickly. I'd love to see more product and less packaging.