A quick heads-up...
After updating my Airport Extreme (Fast Ethernet) to the latest firmware (7.5.2) my Apple TV (1st Gen) would not see or connect to my wireless network (5GHz only). After reverting back to 7.4.2, all is working again - phew!
Couldn't say I had any issues with other devices not being able to see/connect to the wireless network though.
After updating my Airport Extreme (Fast Ethernet) to the latest firmware (7.5.2) my Apple TV (1st Gen) would not see or connect to my wireless network (5GHz only). After reverting back to 7.4.2, all is working again - phew!
Couldn't say I had any issues with other devices not being able to see/connect to the wireless network though.