Walking in them is marvellous - every step a new experience as the ground underneath changes. A slight slope you wouldn't notice in flats is a major thing in six inch heels, and rough ground is an adventure!
I went for a walk on a country path on Friday evening in my 5.5 inchers. About half a mile, on varying terrain, but rough anyway. No problems - easier than in platforms as they tend to topple over more.