We have hickory floors for about 6 years in the kitchen. Looks great ...no negatives about it.
We would however not get random width planks. The wider ones have cupped a little. No biggie, but avoidable.
No water marks at all, they are well-sealed.
No chair marks either a few chairs have rubber feet a few don't.
The animals don't love it, Henry and t he cats spin their wheels on fast starts.