I haven't really tried anything else, but I like my Maxamps Life packs. They came with a build sheet, initialed by someone for each station they passed through. The cells were within .01 volts of each other on both packs when I got them, and they still balance out within .01 volts. It is my understanding that they are built when you order them, and the cells are cherry picked. Performance is very consistent from fully charged until the packs are dead. Granted I'm driving a bone stock brushed Mini Revo (Titan 550) so there isn't a huge amperage draw here, but I'd bet it's around 15-20 amps or so under load. So far so good, I'll keep using them. I believe you get what you pay for when it comes to electronics.