Don’t know what Silvers get but GM and above get fully recognized. I’ve never had a problem. Been able to select Comfort seats online (you used to have to call) and always board first (although it is usually a bus). Lounge access no issue (but they don’t have a lot of lounges). GOL is an efficient airline. Really like them. The only think to be aware of GOL, and most Brazilian airlines, change gates ransdomly. So 1.5 hours before they send you to one gate and then at boarding time you will find out gate has moved (usually no english announcement). Oh well...