I didnt like the chin rest that came on a fiddle.. put one of these on it. not saying its a replacement for purchasing a better or different rest, but worked for me.
Yes, the Gelrests are very comfortable.
Gelrests are difficult to find in the UK, but I found a source and I've ordered one. I have high hopes for it because I don't like shoulder rests.
My chinrest is currently a Hill-style Guarneri (I need something that goes way out to the left so that I can play the G string in comfort) with a thin gel pad (these cost pennies from China. People use them to stick mobile phones to dashboards.) and chamois on top of that. If I need something higher, the Berber is the one that you use, isn't it, Pierre? It looks like it goes a reasonable way out to the left, but maybe I can add more layers to the Guarneri!
(I have a couple of Tekas. These score 100% for comfort, but they aren't right for the G string)