Yes, I've used both ginger and cayenne for quite some time now. Although I have used cayenne for weight loss/thermogenic effect, I have only used ginger as an aid to increasing protein absorption, so I can't really comment on it's use as a thermogenic.
However, as for cayenne, if you can tolerate it, it is a pretty decent thermogenic. When taken in proper doses (follow the label foremost), it causes an increase in sweating. Whether or not this actually translates to greater fat loss is questionable. I will say this for cayenne, I believe that it helped me achieve lower fat levels when combined with cardiovascular exercise.
You may just have to judge for yourself.
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ginger and cayenne 
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