For $250 they're probably good. But I guarantee that there will be some static. Your batteries will piss you off. I, personally, would hate to use them all the time for those reasons. Not to mention interference. Someone will be on a cellphone (especially Nokia) and you'll get that sound in the headphones. I've heard phone conversations on a cordless while using mine, but they're not $250 headphones.
Just try them and see. But there will be frustration somewhere down the line though.
Hypno