I use both Mort and Smart. I think I have decided to just stay with Smart, but still haven't deleted Mort. In fact, I was using it yesterday in testing a problem I was having with the OD app.
I checked on Listen after seeing it mentioned here. I know it's only .99, but it irks me to not be able to try a free version of it first. I don't like buying something I can't return without being able to really test it. I think Google gives 15 mins to return an app? That's not long enough for me. So on general principle, I'm not going to buy it. (Unless of course, so many people here start saying it's the only way to go! Geee, I think I'm a bit wishy-washy!

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