I've drank Kwak a few times but never really took to it; I suppose the frame and the novelty of it may play a part although it does seem to be popular.
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They are really funny about branded glasses in Belgium as the majority of places won't serve you if it isn't in the correct glass. This can be very annoying!
We were in a little place called Lo-Reninge and I remember wanting a Hommelbier but they wouldn't serve me as they had one glass and someone was using it.
No matter how much I said that it didn't bother me what glass it was in, they wouldn't budge. In fact, I've had a few instances in Belgium with their snootiness.
I was called 'uncivilised' in Poperinge when I ordered a bottle of Gueze - the size of a wine bottle - and drank it before asking for another within about 1/2 hour.
How was I to know that you're meant to sip the thing for the entire evening as it's still brewing rather than drink it like a pint in less than half an hour?