Our way of camping usually with a small open boat (<80ft) or a car and a 2p tunneltent.
we used it primarily as a sink - indeed in places where water was plenty (like lakes or state parks). Agree with the previous reviewer that when there is not much water, the sink is rather unstable.
We are however rather positive about it. We usually do not take a bucket with us, because it so bulky (in addition to the set of lightweight camping pans and the water container). When doing the dishes in a pan, the pan is usually too small for plates and cutlery.
For our level of comfort, a bucket would be handy to do a quick laundry wash, or the dishes. This sink was for us a durable and compact solution. The self-support depends indeed on the level of water, hence when the water-level becomes too low, (like <7 liters) the 10l sink becomes rather unstable. But on the shore of a lake this is not an issue.
The basin doesn't support itself very well unless it is nearly full of water so if your using it somewhere where your trying to conserve water it isn't that great, but if water is abundant and you can fill it up all the way everytime you use it, it would probably work well.