I was thinking of buying a handle like this for my mother in law.
is it easy to use?
If you are talking about the one I linked to, yes. Much easier than trying to pull yourself up from something above.
I've only felt like using it 3 or 4 times so far but it's a bit like pushing on the arm of a chair to get up compared with trying to get out of a chair without solid arms. Only people with mobility issues will probably be able to relate to that.
To be honest it came up on Facebook from a crowd called Phone Bibi in the United States and it cost me closer to A$20 I think. I never thought to check for other sources such as Ebay at the time (about 5 or 6 months ago)