I recently stayed in Novotel Mumbai and they upgraded my room without even me asking for it.
Last week at ibis styles in bangkok I requested them for upgrade and they said that they can provide upgraded room from tomorrow. Next day they upgraded my room to bigger room
Similar good experiences in other places too. Also they gave a food basket in room on the first day at Mumbai and pattaya.
The reception at all the places of ibis and novotel were very courteous and thanked me for being loyal and gold status holder.
So overall I am satisfied with Accor gold status.
Though I may not renew it as didn't use the free vouchers and my stay has already crossed 55 nights