Modern and clean bus, pick-up was late, overall very satisfied.
Sometimes the driver drove a little too fast but it was fine for me since the driver was very friendly and helpful.
Left a bit late, driver managed ok on the "Death Highway" to Sihanoukville, weaving in and out of the convoy of trucks in at times heavy rain.
By far the scariest and worst bus ride I have ever taken. I can't even count on two hands the number of near death experiences I had on that trip from Phnom Penh to Sihanoukville. The driver was an utter maniac. For your own safety don't choose Bayon.
The driver was so rude and argued back to the customers and always talked on the phone while driving. Also he stopped the bus many times to take passengers along the road and over speeded sometimes that make passengers feel like car sick.
The departure is on time, bus clean and helpful driver. one thing that you should improve is passenger waiting room(Sihanoukville), it is really hot while waiting the late passenger.
Good and safe