We used the office on Koh Rong. The initial custom...

We used the office on Koh Rong. The initial customer service was terrible but later we learned we had been lied to in order for them to cheat more money out of us than necessary.
Our boat driver took 20 min to get off of the dock, badly damaging his and other boats in the process and then insisted on driving at just over idle speed to save fuel despite us having paid well over premium price for a private boat. This resulted in our 20 minute trip taking well over an hour. We heard similar bad review stories from others guests at our hotel later that day.
Save the hassle and opt for the locals and their long boats.