I just tried to test ezstems with a song I'm working on: Too Rich For My Blood by Patricia Barber. Song Master Pro did the song analysis pretty quickly and took a couple of minutes to create the 5 stems I asked for. It did a very good job with the stem separation. I tried using ezstems with that song, but was told that the max file size for the free version was 5.2 MB. Too Rich For My Blood is a little over 80 MB for an 8 minute song. So, I wasn't able to do a stem comparison. 5.2 MB is pretty limiting, and if I've got to pay, I might as well use Song Master Pro, which I've already paid for.

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