I think the microwave oven thing is a bit of a red herring. 2.4GHz is used for numerous things, including wireless routers, video senders etc, and reliability is very good. How many people have wireless routers and microwave ovens in their homes these days!!.
You are more likely to expereince interference from another wireless device, i.e a wireless router, other camera system, or video senders etc. I have been using 2.4g devices in my house for a fair while now without any problems. INterference can be fixed by using an alternative channel if it occurs.
Regards,
Wexfordman