The Priority Pass affiliated lounge in KUL is a bit of a disappointment, especially compared with the superb MH Golden lounge next door.

As of last year, IIRC they had 3 very old computers (W95 with 16 or 32MB RAM), unusable with more than one window open. If you have your own laptop, unplug the Ethernet cable from the relic and into your own machine (DHCP on), as the connection itself is fast.

Its showers were not particularly well maintained or designed (very hard to keep socks dry), food selection sparse but ok. Do tilt your (chilled) glass before using the beer on tap, as an Irish gentleman showed me, otherwise all you'll get is foam!

The eateries in the KUL satellite are overpriced and serve poor food.

In my experience, immigration is relatively quick, but lines can get long at emigration if you get caught behind a wave of inexperienced flyers to SE Asia.

All in all, KUL is a physically superb facility with relatively efficient operation (mostly because it is underused) but not much to do between flights.