ACI Zero Gravity
Saves money over time
Long charge time
Mediocre battery life
Can overcharge and ruin battery
I used this on my old Spyder E-99 with old ESP frame. It did it's job, but could use some serious improvement. A big thing is that it doesn't have a long enough life. You can too easily reach its maximum shots in one day and it quits working. So that isn't a plus. The recharge time is VERY long. Remember to charge the day before or your through. That aspect is very annoying. It also can be overcharged too easily. Be very careful to not forget. I have seen dead batteries because of this. The only plus is that it saves money. Overall it works, but it could much, much better.
Use it to save money on batteries, but be very careful about overcharging.