have used it with someone else before and i can say i prefer nastrasol its fun but i prefer a more thick and heavy goop though i think if you mix for longer and/or leave it standing a while slude can thicken quite nicely
It's great having large quantities of it. I never use the full amount of water that is recommended as I prefer it really thick. Once you've mixed it up, leave it for at least 8 hours for it to really thicken up.
It starts to water itself down after 12 hours or so.
We used it a few months ago, I added a little too much water to it at first. I also had a hard time mixing it. But once we got all the bits dissolved it was fun, but I would have loved it a little thicker. (full disclosure - The Slube was old and the tub was bigger than average.) But I would try it again.