I've just finished a 2 year stint on Abiraterone.
No real side effects to talk of, though I am on HT in parallel and the typical HT symptoms I've attributed to the HT regime.
I did have some sleep issues until I was directed to take the Abiraterone and associated prednisolone during the morning as steroids can have an effect on sleep patterns.
Apart from that - plain sailing.
Hope that helps
Kevin