Construction:
The G-Wiz LC Deluxe has both a G-force sensor and a barometric sensor for launch detect, motor burnout and accurate altitude determination. Because of this, it is not affected by Mach transitions. Having two sensors enables it to add an additional output channel for clustering, staging or air-starts.

Pyro output 1 - Jumper select between Launch detect for clusters and Burnout detect for staging or air-starts

Pyro output 2 - Fires at Apogee detect for drogue deploy.

Pyro output 3 - Fires at a fixed low altitude for main chute deploy.

The G-Wiz comes in a pre-set main chute deployment altitude: 400 feet or 800 feet. I have both units, but this still limits your options.

Status LED shows e-match continuity before launch, and maximum altitude upon landing. It is also able to tell you how you have the unit wired and the jumpers set. Having lights instead of a beeper can be bothersome because you have to look through a hole in the altimeter bay, instead of just listening from the ground. This can be a pain when your hole is 15 feet off the ground.

It can use one or two batteries for operation. One battery will power the board and fire the e-matches. You can also use two batteries by removing a jumper wire. Using two batteries separates the board from the pyro channels. This ensures you have full power to the board during an e-match firing. There is not a battery mount on the board like some altimeters. I like this feature because it allows me to use whatever battery I want and put it wherever I want. I usually use two standard 9v batteries.

For arming and disarming [for every altimeter I use], I use the push on / push off switches that PerfectFlight sells. I like to mount all my altimeters with plastic PC board stand offs and stainless steel screws, onto a ¼" aircraft plywood board.

Flight:
I have flown both of these altimeters a few times, without fail. The "motor burn-out" channel works flawlessly for air starting my large two-stage rocket. Although I only use altimeters in big rockets, its small size allows it to fit in 29mm airframes.

Summary:
Having three output channels makes this one of my favorite altimeters. It's slightly harder to use than some of the simple two channel altimeters out there so a careful study of the directions is required.

Overall Rating: 5 out of 5