After reading a similar thread I ordered the Insight CD as it's very cheap in comparison to holosync. I don't think you need to pay big bucks to get good quality. I've been using it for a week and it's very good for meditation. I don't fully understand the technology behind it but I have had increased focus while working recently. Whether that's beacuse I think i'm getting benefit from the CD or I am benefiting from the CD the result is the same
The insight CD somehow keeps me awake which I like, I don't like to drop off while meditating! I've also been getting some very weird dreams!
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