No, we've never taken any tour (Tracks or others) within the U.S. and Canada. We've always wondered why people want to do that when they can do the same thing on their own and at their own pace. From my viewpoint a tour doesn't allow you enough time to see and do what YOU want to see and do. We prefer to have the flexibility of changing direction if we choose. I guess I just don't like to feel like I'm being "herded" around.
Tracks was very good when we took their Copper Canyon tour. In Mexico you're probably better going with a tour group, especially if you don't speak Spanish. We had a great time on that trip and met some very nice people with whom we're still in touch 15 years later, so I'm not saying tours are bad, it's just that we prefer to be on our own and do things at our own pace.
ArdraF