As the one who started this thread, I apologize for not coming back with my verdict at the end of last summer's camping season. I ended up getting some samples of both the Inca Gold liquid and powder. I used the liquid on a 7 night dry camping trip with our church, in which we only used the toilet at night for #1. I did add the Inca Gold at double strength because I new it would be a long and hot week for it. In conclusion, it held up as well as I could expect from any products. For the most part, it was always just the strong fragrance that would hit you every time you lifted the lid. This was a far cry better than my experience with the Aqua Max that we used earlier in the spring. After a couple of nights in much cooler weather and using the toilet in the same manner, the smell was unbearable.
Also, I tried Happy Campers on a much shorter weekend trip at the end of the summer. I like how there's no smell (not even a fragrance), but because the product has no die in it, the look of the liquid after a while is enough to make someone queasy
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For those reason, I believe the Inca Gold will be what we stick with for now. I'm not overly fond of the strong fragrance smell, but I installed a toilet vent fan, as some others have done on here, which I'm hoping will help with that.
Incidentally, If anyone is interested in trying out the Inca Gold products, just give the company a call and ask for samples. They seem to be very accommodating to this.