I use this. Yes, latency is kind of big, but it's tolerable. The big difference for me is that you have to program every command. I've never used the Echo, but my understanding is that it has a ton of pre-built commands that you can use: set a timer, what is the weather, play somesong, etc.

For jasper (pocketsphinx) you have to manually program the action for all of these. So it's a lot more setup. I still like it and use it all the time though.