Thinking about absolutely rubbish mobility aids, gadgets and other medical equipment that I bought on promise could help and ended up being binned or the charity shop.
Share you insight!
Me :
Tried 2 sorts of bum wipers the sort that are a plastic stick that “hold” the paper and reach around to wipe your bum. Expect the paper would fall off as soon as it touched you skin so despite various techniques was bugger all use. Had to go in the bin because no one wants to buy a second hand one 
Pick up/grabber stick that was advertised as being able to pick up a tin can. Except you need the strength of three men to squeeze and hold it to pick anything heavier than a pair of socks up.
Over the bed table that was impossible to level each side and if you breathed as much on it would pour tea over your lap.
There are plenty more need to consult Amazon’s & ebays past history!