The Astro chargers that I used to use, overcharge in the 3rd cycle. The newer 5350 cells don't like being overcharged. The older 3700 cells that I used to fly didn't mind, but the newer cells are a different chemistry and can't handle being overcharged. Flight Power was good enough to lend me some packs for the nats though. I have since switched to different chargers. This was the first time I've had any issue's with batteries.
Lets face it, electrics will still be in the learning stage for quite some time. That's why I say, make sure it's what you want before switching. Because mistakes (that you don't even know about) can cost you a lot of money.
With the new line of Dz's, the power and speed range is certainly there for the glow planes. I was really impressed with them at the nats.

Chris