From my own experience , no there was nothing good. My marriage, family life, education, every thing about my life was impacted in a negative way while a witness. And NO it was not the demons attacking me.It was the slaving & sacrafice for the WT & the congregation"s unloving attentions.
I also never heard or met a single person who witnessed to their life being better. Brother & sisters would often tell their story of how & when they became a witness. Jump to telling all they did or privalages they had. Just that by being a witness they were better people, never a personal example from their lives.
I remember an elders public talk all about what an a$$ h*le he had been to his wife & kids. How he had fought her to not be a witness, then was converted. Still a total jerk to his wife and rotten father.
This is not what I have found in Christian testimony,christians are able to give a witness to their faith and examples of the fruits in their lives.
BF