Are those black tank cleaning wands worth it?

We have the tank wand and even have the connection to attach it to the sink. First, the sink does not put out enough water pressure to really allow the wand do what it is supposed to do. My hope with the wand had been that for the first time since I got the RV new, I would see the black tank monitor read empty. That was a nice wish that never came true. I have used the tank wand a number of times dragging a garden hose inside the RV to the toilet and spending a good amount of time "cleaning" it. Maybe it is working but I have not really seen any difference than just filling the black tank with water after dumping (my tank is only ten gallons) and then running that through. My RV has a permanently built in macerator - no gravity feed and no ability to back flush the tank with any type of attachment. We carry the wand and the hose with us - just in case - but together they take up more room than they are worth in the limited space that we have in our Class B.