I had a Zulu strap on my computer on a recent trip, and I wasn't thrilled. Even with a 3 mil suit, the compression still made the computer flop around at depth. I'll be going back to a bungie mount.
For the complete picture I should mention I wear my watch/depth gauge/timer on my right wrist nearest my hand, and my further up my forearm -i.e. where my arm starts to taper. So I'm not providing an optimal location, but having the computer spin around my arm and out of view while trying to do a controlled horizontal ascent using my left hand to dump air was just not ideal.
Henrik