Khai Nam has the first bus to depart in the morning - their service is fine. Seats not quite so spacious as Kumho, but tickets at $9 are cheaper.
The instructor is a genius, very helpful. Also, the woman in front of Ourissey Market is amazing. Very professional and helpful. I have booked the way back with the same company! Thanks for everything, I love your Khmer kindness.
I bought for my mam. And the bus company charged my mam another 8usd. Disappointed.