I've flown these devices extensively and they work. The versions I have I believe are Version 4 as they have the LED. The green LED acts as a continuity indicator on mine. One can test with an LED on the terminals. Tip the device over and the LED at the
terminals will light (indicating current is being sent) and the green LED will go out. Aerocon sold these and they were designed by Robert Galejs who I believe has a Phd by now. Do not attempt using homemade ematches unless you are sure they have the same specs as commercial matches. I tried and dorked my first unit. I tracked down Dr. Galejs and he very nicely accepted mine and fixed it. (I dropped 15 or 20 bucks in unsolicited) So only use commercial ematches.
Also, once activated,
DO NOT TIP OVER! I know that sounds simplistic but it's easy to lose one's track of mind at a launch event if something happens and you have to take a rocket off the rail. I've never had that happen to me as I treat the device with the utmost respect. Also I recommend testing with an LED or christmas light on the ematch terminal because the angle of deployment is different N-S, E-W so you get an idea of what to expect.
One wouldn't want the rocket going off at an angle because it could lead to a high-speed deployment coming over the top.
I mount a lockswitch on the bulkhead of an ASP WAC Corporal, put the rocket on the rail, raise the nosecone/coupler, turnon the lockswitch, confirm the green LED is on and lower the nosecone/coupler on the bodytube. Insert igniter and fly.
The ASP (large WAC) has the nosecone mounted on a coupler that has a bulkhead that slides into the bodytube. The nosecone shoulder just needs to be trimmed a bit and that coupler is a perfect ebay for this MAD unit. Use four screws to hold the coupler to the nosecone shoulder and good to go. Only thing one needs to buy is a locking toggle switch! It's a real sweet rocket for this device. With the Jolly Logic Chute release can use some pretty nice
H motors to fly.
As a kit, I think they originally went for 19.95 and went up to 29.95 over time. There was an assembled version for more. The OP's price is very reasonable and with care a person can have fun with them. Check out the ASP
38mm WAC if one would like a shoe-in kit.
https://www.asp-rocketry.com/ecomme...ge-29-38-mm-Version-.cfm?item_id=631&parent=8
Punch a hole in the coupler near the level where the green LED resides so one can see it's on.
The only other in production MAD device is the Zeptomag that is pretty feature filled:
https://www.tindie.com/products/ZeptoBit/zeptomag/
I have a couple. Can turn it on and since it is activated by an accelerometer, it won't fire with a simple tip over unless it's in flight. Kurt