I have used Pulse, Gens Ace, Turnigy (standard blue), Zippos, and Turnigy Nanotechs. Out of those, the only ones I would stay away from are the NanoTechs. It also depends on the application. I am not going to use Turnigy or Zippo batteries in a $4k plane, but I do use them in my 60 size electric warbird, my King Kobra, and have used them in a 600 size helicopter. All with no issues. I stay away from the Nanotechs due to them puffing very quickly while using them (I always charged them at 1C).