Excellent, free product. I use it a lot, so it's actually important to me that it's visually attractive, which it definitely is. Being able to see left and right channel independently is great.
My only realistic complaint is that it is more CPU-intensive than I would like. Not terrible, but high enough that I often shut if off when not in use, and my computer is above average in power.
My less realistic complaint is that I'm bummed it can only do one channel at a time. Yeah, I know, they have the MultiFreq product that I can buy. But c'mon, how about just TWO channels? That still leaves something to be desired for people that realize they really need/want 4 or more, but still gives us cheapskates a great, more useful, free product that might eventually entice us to upgrade to the paid vesion. As it is now, most people have only ever used a single channel analyzer, so they don't know what they're missing. If you don't show them the power of multi-channel analysis, they'll continue to not see the point in MultiFreq, and they won't shell out the money for it.