I've owned several ADEPT22 and have not had the best experiences with them, the last two flights I used them on they did not fire the ejection charges and luckily I had a redundant PF Stratologger that did work and fire them. The ADEPT22 seems to be designed with a lot less tolerance for battery voltages and especially didnt like certain ejection igniters such as my quick burst when the battery voltage (I was using a 9 volt) was the slightest bit lower than 9.00 volts. My PF Stratologger was always rock solid and would tolerate lower battery voltages and many different ejection igniters even higher amp ones versus the ADEPT22 which for me was hit or miss on some of these and if your battery was the slightest bit low forget about trying to ignite a quickburst with the ADEPT22. Can't say I'm all that sorry to see them go, I had since taken them off my Avbay sled due to some of the issues I had. Also didn't like that the terminal block did not have all the necessary connections needed for the drogue and main, had to resort to twisting together extra wires to the common terminal, what a pain and what a clutter. The PF Stratologgers I purchased were around $70 if you purchase from them direct versus the $40 for the ADEPT22 really for me not enough savings to justify the ADEPT22, especially since the PF Stratologger didnt cheap out on the terminal block as all the connections needed are in there which makes it easier to wire, cleaner, and also I suspect better circuitry since it is a lot more forgiving on the voltage levels and different ejection igniters. Also I can download my flight data easily to my computer and print graphs with the Stratologger something completely lacking on the ADEPT22. I mean really if the ADEPT22 was soooooo successful and sold sooooo many (according to the ADEPT website) why are they being discontinued, I think products like the PF Stratologger are the reason it is being retired. It seems like at one time ADEPT altimeters were on the leading edge but they rested too much on their lead now when you look at what they offer versus some of the others such as Perfectflite, Featherweight, and Missleworks it seems that ADEPT has fallen way behind.