Had to reply.
Our LO is 10 mths, bought one 3-4 mths ago for when Littleone coeeos on OH side of bed...
We used to have a troll cot, but aged 6 mths stood up and almost fell on floor.
After rolling off our bed one morning.. I invested in one of these. For normal or adult knee high beds I do recommend one of these. It saves the accidental slides.
I also have a wriggler. So for his last 2 months in troll cot and since in his big cot (which he is in as much as I can put him in - when he has a cd there's no point- ) he has breathable air bumpers.
He likes the soft edges of the bed rail, play pen when up and the breathable baby air bumper.
I like it as it saves rolling around and high falls.
If I had a lower cot/or adult bed. I probably wouldn't worry. But I have a easy to get out of bed... Hence the issue.
For the single adult bed in his room. Looking to sort out the radiator wall side and the side I try not to fall off when I end up in there.
I have read all other posts.
You need to decide what works for the type of LO yours is like?
Wriggler?
Likes to feel safe and encased?
Then yes you'll find it useful.
And you can always get a secondhand one to try, rather than pay 20-35£ for a new one.