I did the Son Doong tour with Oxalis in early April and it was quite fantastic. The preparation was adequate and tour guides were really easy to get along with. A heavy focus on environmental protection was enforced during the hike and it was evident throughout the cave and surrounding areas. As an American, I have a knack for finding the bad in every situation and complaining about it. (natural gift of Americans). None could be found in this tour.
If I had to make any side note on the trip, I'd say that the company is under charging for the quality of service provided and the enormity of the scenario. I'm recommending this to all my friends and family. Not that it's necessary with the ABC Good morning america coverage.
For safety's sake, I recommend elderly, injured, or out-of-shape (including round) individuals skip this tour as your inability to climb, hike, maintain stamina affects the entire group. Not only their experience, but their safety. The preliminary vetting of customers if answered honestly, should cover this, but people lie in bids to complete bucket list items.
With any luck, the government will support this operation for years to come.
Lastly, a shout out to Oxalis and the porters. You guys were amazing. And that rice wine you guys brought along... whew
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