Sounds normal and if you're still worried try putting the IS off.


Take a photo at 1/30 of a second (or any shutterspeed which you normally couldn't get steady without IS). Keep the settings, push the IS back on, let it work (it takes like a second for it to work fully when half-press the shutter-button) and take the same picture. If it is significantly sharper, no motion blur, you'll know it's working properly.


But again, it sounds pretty normal []