Yeah, they're supposed to get some pretty impressive transmission distances.
I've got one with a massive antenna connected to a Raspberry Pi and a couple of arduinos with the tiny antenna adapters around the house transmitting temperatures. It might be because mine are indoor with decent thick walls but I've definitely seen some range issues. It could also be 2.4 GHz interference. I imagine in an open space you'd get great range.
EDITED: 3 Jan 2015 23:06 by ANT_THOMAS