At last inventory I had 45 airplanes in flying status. I keep the A4's on 24/7 and I never know until I get ready to leave what I am going to fly that day. I also use some wall wart chargers with a timer. I have a couple of planes that take all four ports of the A4 to charge the onboard battery packs.

Also, I have bought these 10 over the last 9 years so the $$ sting per year wasn't too bad.

Price for performance, it is still the best charger for my type of flying and charging. There is a new one from Germany that looks fine but by the time you buy the AC power supply it cost about $100 more than the Alpha.