Your guess is as good as mine. My parameters were simple. Fast square wave rise/fall time (most are 100 ns, which seemed too slow to me, given what some of Ti's amps measure at), low distortion sine wave and relatively compact. I'm curious to compare the sine wave distortion to what one can generate from a CD player, for example, or even a sound card. I think these other methods might work pretty well, so, when it came down to it, square wave performance was what I cared about most. Ti uses a Wavetek 188, which is another datapoint to consider. This Tek should be twice as fast as that in theory.