I have visited the Lounge in T3 (concourse B) and T2. Have not visited Lounge in T3 Councourse A which is newer.
The lounge in T3/B is not that big, on the second level above the main duty free level with an open ceiling (like the EK lounge) so not claustrophobic. Selection of hot and cold snacks. Soft drinks and booze. Free WiFi.
Nothing to write home about, but adequate. I have free access through by credit card provider. Would not pay for a short stay but is perhaps a good place to escape a busy terminal for a couple of hours.