Review: OddityRC F405 Mini 40A Stack (Vortex F4) – Only $35 for Both FC and ESC, But Is It Good? I thought SpeedyBee had already set the bar low for FC/ESC stack prices, but these new Vortex stacks from OddityRC are half the price! Despite the budget price, they come with a surprising list of… The post Review: OddityRC F405 Mini 40A Stack (Vortex F4) – Only $35 for Both FC and ESC, But Is It Good? appeared first on Oscar Liang.