Dellortoman said:Should be stable enough to work on. Probably more stable with the stand chocked than not, if it's a bit too short to have the full weight of the bike on it when not chocked. But here's a tip for the uninitiated:
When undoing or doing up large or tight nuts or bolts on a bike that's on its centre stand, don't have the spanner in such an orientation that the force on the handle is towards the front of the bike, otherwise you could push the bike off the stand. It may seem blindingly obvious, but I did once see a bloke do exactly that when doing up his rear axle nuts (no, it wasn't me). If you need to apply spanner force in that direction, use your other hand to apply a counter force.
I came.close to this calamity