I truly cannot recommend this loo enough.
I am a big girl and it supports my weight without a hint of a creak.
Excellent for my 5yr old son too.
Made a recent camping trip much more comfortable, especially as we had lashing rain for 24hrs and it was sooo cold at night. Very glad I didn't have to tramp across a wet field in the dead of the night!
Also, the campsite I went to was an eco one with composting toilets, so I did not use any chemicals or anything. Lid down no smells, it was perfectly fine; that includes my son emptying his bowels too. I just made sure to empty the bucket in the morning and gave it a quick rinse with water and washing up liquid.
I've also found it to be an excellent "potty" for minded children too (I'm a childminder) It's low enough for small children to be able to get on easily enough, and the bucket seems to ally the fear that young children sometimes seem to have about falling down the loo. Plus of course, much less risk of being knocked over, because it has a very sturdy base.. and can pop the lid down if you can't empty it straight away.
The only downside really, is when camping, it takes up quite a lot of space in the boot; I have a zafira, so it's not a problem, but if you have a small car with a small boot, it will take up a lot of space.