Some days ago I wrote about the Privium lounge at AMS, available only to people who have the iris scanning entry card used at the airport.
I had a little time so decided to pop along to the regular lounge used by Lufthansa in Amsterdam; the Servisair Lounge.
My travel experience was not enhanced by the visit.
The seats provide little, or no back support. Free WiFi is limited to 2 * 30 minute logins. OK if you have a short time before your flight but as the lounge seems to be used by several Star Alliance airlines this seems a little mean.
Well worth avoiding if you have any real alternative at AMS