We had a nice trip from Sihanoukville to Phnom Penh on nice roads and nice views.
Didn't have all the facilities like charging ports or wifi. Just a normal bus. Ride back to Phnom Penh was smooth but drivers were chit chatting away like school girls so bring headphones to block off the noise.
PSD Xpress is, by far, one of the best companies that I have travelled with. Buses are comfortable and wifi is relatively stable :) Pick-up was on-time and well-arranged as well.
The drive was great, I'm was very happy with the WiFi connection. Some of the seats appeared to be broken and would just recline as soon as you sat down in them, it seemed the the handle to recline was broken
Seats are very spacious and comfortable. I felt cozy during my trip. I could say this bus is much better than any mini-van. However it took 5.5 hours to reach Phnom Penh. I will use this company next time.