We did No.1 Lounge on our last trip and I did not care for it - much preferred Servisair.
It was quite small, and when we arrived, all of the tables and chairs were already taken, meaning we had to stand around for quite a while. But my main bugbear was the bar - you could not just go and get yourself a drink from a fridge, you had to order it and then it would get delivered to your table by the staff. Unfortunately this took about ten minutes, which is rather frustrating when you're thirsty and all you want is a Coke!
It's certainly posher and has a nicer ambience than the other lounges, but that doesn't do it for me - I want a lounge where I have a choice of where I sit down and be able to get snacks and drinks easily.