i have one, it's not from aldi but it's pretty much the same, it fits nicely under the back of the cannons forge bed (in a big plastic bag), does mean i have to open the back doors to get it out, but it doesn't get used much!
I've got the Aldi one and it's in my rear kitchen in a box. I sit on the box to cook, no raising roof, and it's just the right size. Not used it, it's for my wife in case of nighttime need in winter but it's just the same as Porta Potti.
We bought one from Lidl a couple of years ago. Got a real surprise when the instructions were for a Thetford (Probably the best portable loos made). Seems this is just a rebranded model (and about half the price). Brilliant bit of kit and worth it's weight in gold if the toilets at Vanfest are like last year!