Accuracy, reliability, safety. I had a battery pack short out in the middle of the night and the Alpha caught it and turned off. Battery pack, wire harness, switch all were melted but no fire. I dont know if there would have been a fire with any other charger but I darn sure know I am glad I had the Alpha at the time! Just put a new battery and switch harness in the airplane and went flying.

The Accucyle I have, a Pro model, needed to be calibrated and even then only uses a timer to calculate the charge left in the battery. The Alpha moniters and records the charge left.

I honestly believe the Alpha to be a better product. Just my opinion though, Red is a better one to ask but he has not responded to this thread yet.