I also have the open logic sniffer and like it more than the other posters. The fact that it costs $50 (don't buy from Sparkfun for $70) is a factor in that. It's pretty darn useful, though. The client code could be better but it does what it's supposed to do. I don't mind that it downloads the data when the capture is done. It's pretty quick for that.
On the issue of echos on the unused lines. This is a problem because? Like you don't like seeing them on the display? They are pretty innocuous. I have a stripped piece of wire with a clip on the end to which I attach all the unused probes and then clip to ground. I like it more because it keeps my probes from flopping around, though, and often don't bother with ground.
I think it's a great LA for learning about LAs.