I agree with the logitech ones. However I did experiance a sticky sqaure button on my original one. Took it apart, cleaned all insides, put it back together, still sticky. I called logitech, and they sent me a brand new one, and also told me to keep the "defective" one, or throw it away. Very thorough customer service. Didnt have to call them but once, they called me altogether like 5 timees to update me on my shipment.
So now I have two good wireless controllers. (figured out the sticky-ness) And yes, they do work well side by side simultaneously with no bleed over.
PULP (pulp) n. 1. A soft, moist, shapeless mass or matter. 2. A magazine or book containing lurid subject matter and being characteristically printed on rough, unfinished paper.