Hmmm! I have an SQ-A, but I'm not in the habit of placing glasses of water on (or even near!) my cameras. I use mirror lock-up and a tripod rated to hold 17 pounds and I can't say I've ever noticed any problems. Of course, the SQ-A has a strictly mechanical shutter release. I guess I wouldn't be all that surprised if I learned the electronic release in the later gear bangs stuff with a hefty solenoid, that would fit with the last few decade's use of technology "because it's there."