booy: pricing depends, after calling few agencies it seems that for first class ones, prices can range from S$60+ all the way to S$70+. The one I took was S$65 from Transtar.
iirc they told me they have toilets in the bus but it's only for urinating, not for passing motion. I didn't use it though, cos they will stopover once at one of the rest stops on NSHW for toilet break.
I used to have the same thinking as u too but all that changed after my this trip...it is indeed luxurious for that kinda price and no worries even if jam, can always sleep or watch tv.
DS: thanks gal...very nice, me, my wife and MIL walked quite a lot to the shopping malls for food and shopping hehe. Really cheap and good as compared to SG's. However one bad thing is that taxi touts are all over the place even though there's a big big signboard in KLCC stating it's against the law NOT to use metered fares. Even worse when they can tell that u are tourists there, they will attempt to fleece u off.