no, you do not have to worry about any interferance whatso-ever. you can play it at the neighboors house. its 900 MHz, so of course theres no interferance. and yes, they are worth it, the second best controller ever concieved to video games.
the best, of course, if the Logitech wireless x-box controller, the comfort grip is excellent, the d-pad conforms wonderfully to your finger - ive never experienced such a wonderful feeling d-pad. and the excellent extroverted analog sticks. *DROOLS*
yeah, get that, and get the logitech xbox wireless after y oure done with that...