Used this company to cross the border between Vietnam and Cambodia and as a woman solo travelling, I felt so safe!! When you arrive at their office, they ask you for your passport and the 40$, and they keep your passport until you get to the border (so don’t panic!). The driver was friendly, the seats were comfortable enough for a 6hrs drive and you get a bottle of water and some snacks. We got stuck in traffic for a while so got to Phnom Penh later than expected, but we had a couple of toilet breaks. Once at the border, another employee from this company takes you to the border offices and sorts everything out for you and waits till everyone is done. The whole experience was very smooth and stress-free. Could not recommend this company more, truly great!