Yup bro -- the entire housing which was the size of the length and width of my projecter was screwed heavily on the ceiling so it was really very sturdy. In fact there was a time that i even placed there my bluray and my dvd players because i could not find a long HDMI. At that time i never noticed any trembling motion from the PJ even when i watch movies on high volume.
Now with the ceiling mount, the trembling motion of the image is very evident especially when the menu screen is flashed on the screen.
I may try resolving this by shortening the length of the metal hanger that holds the pj by about 8 to 10 inches and if the trembling motion of the image will still be obvious, i may have to re install the box housing of the pj.
AX100e on CDRKing ceiling mount