Don't think twice - just do it. This was such an incredible experience. Oxalis is such an incredible company in terms of organization, community involvement, and overall quality of the expeditions. Words can't really capture the immensity of Son Doong so I'm not even going to try. All I can say is that it's unlike anything you've ever experienced. The food is phenomenal, the guides and porters are incredibly kind and knowledgable, and the location can't be beat.
In terms of shoes, we went with La Sportiva TX-3 Approach. Don't get the Solomons... a few people had them and they had terrible grip. The Five-Tens seemed ok (ordered a pair of them as well) but they're totally impractical for anything but this cave experience. The La Sportiva's are a great hiking shoe in general, so I'll be using them regularly. Otherwise I'd say follow the packing list Oxalis provides and you're be completely prepared.
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