The field stand pivots far too low which makes the bike inclined to tip and in fact the rear tyre can start to move sideways as there is little weight on it.
When I first rebuilt mine, I moved it outside to photograph and was able to watch it slide off the field stand through the view-finder. I didn't know whether to drop the camera and jump for the bike but in the end, I stood there like a rabbit in the headlights.
It is essential to have the bike in gear and the stand can be handy on soft ground but I prefer a tree or a gate post.
The stand is fine but due to its design has a tendency to "slide out" on hard surfaces. Just remember to "chock" it either with the kerb or some other immoveable object. It was designed as a field stand after all the idea being to stamp on the foot so it has purchase.