Working with a pair of NRF24L01+ modules, Arduino Nano's and USB battery packs, I slightly tweaked maniacbug's pingpair sketch to give me a little visual feedback, a green blink for successful packet trip and red blink for everything else. The ping module had the red/green LED's and the pong just had a bright, white LED that I could see as I carried the ping module away in my hand. Range results for line of sight were 250m for solid connection (no timeouts) and 325m for a flaky connection (hold it just right). It's not very scientific, but I've repeated it several times.
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