yes.. they kill a lot of vibs in the bars. my 97 had really heavy bar ends stock. felt like they were made of lead lol. atleast a pound or some. I had them off one day, fired the bike up and it was wayyy worse vibs thru the bars.
if you don't have an issue with your hands going numb or something, I wouldn't worry about adding them to your bike if you don't like them.
Well my vertical twin makes some serious vibrations. Triumph has done a good job trying to balance it, but my hands can get pretty numb. Maybe I should try some.