I have a close Chinese friend who listened to some of the recordings on my IPod - she said go with CLO. She constantly remarks on my great accent which she says is always the biggest problem.
I travel a great deal and knowing Chinese, even a little, can only be helpful when 1/4 to 1/3 of the worlds' population speaks Mandarin Chinese. You are doing a great job - I seem to be going very slowly; however, my friend says I am not but rather she is impressed with where I am and again is most concerned about the correct accent.

I’ve listened to most of the Mandarin language podcasts since they began emerging on the new media scene, and the good news is that they all have something to offer to the Mandarin language learning community. Being a part of this community, I appreciate the fact that choice among content providers is a good thing for all of us to have. When it comes to the Mandarin language, itself, like any language, it’s made up of the same words regardless of who is teaching it. Of course, which teaching methodology you prefer will depend upon your learning style.