Dicky, yes they are.
Because of circumstance we did a 200 mile + day ride with only the clutch side fitted. The difference was instant.
1. First noticed it just felt comfier.
2. It was instantly warmer than the other oem grip, but the heat doesn't build and equalised after a while. Note I have not got heated grips.
3. No difference in how the bike rode, inputs required etc.
4. The not too intrusive vibrations were lessened anyway. There was no buzzing in my fingers after a 2 hour stint. Again better than the other grip.
5. On the return journey my right hand fingers started to cramp up and there was pain in the knuckles, the grip puppy side was all day comfy. The cramp might be just me, I started with it on the Pan in Spain this year. Repeated long days also lead to trigger finger. There was some of this in my right hand on the day ride but none in my left.
So again, yes, I like them and wonder why I never fitted them before. Be aware the original grip may loosen if you need to wrestle them on, with the zip ties this wasn't an issue.
Good luck.
Upt'North.