We used it Friday, Nov 21. Our arrival time was a literal madhouse. I believe three flights landed within 10 minutes, one was at the gate the same time as us.

The immigration hall was entirely full. When we got off the plane, I believe there were 8 reps standing at the bottom, we were taken directly to the front of emlime for immigration, and subsequently customs. Took less than 15 minutes to retrieve luggage and get to Tim Air (where we had to wait, because we were early!).

This time, club Mobay was entirely worth it in my opinion, but... Like you, I have used it and seen it as a crap shoot. My thought process is, in the grand scheme it is not really that much money, and in cases like our arrival day, the time saved well made up for the money spent on this and previous trips.