I think it gets back to the performance you require. Companies make these devices. They make them according to a specification. Frankly, I don't know where they get that specification from. We've talked about how they work, under ideal conditions maybe to meet that specification, and under less than ideal conditions they probably don't meet the specification.
When you talk about improvements, it would seem clear from what we've heard that some people think these things don't work as well as they might. So improvements might be necessary. Again, that's all very tightly linked into the environment you're trying to operate them in and the operational requirement. So you really need to do that analysis to determine where the shortfall is, if there is one in terms of the technical capability of the device.