I think Cartier has a beautiful line of watches! I got the medium Tank Francaise several years ago because I wanted a casual watch (I have a couple of others, also). It is very well made and the bracelet is smooth as silk. I have considered the Cartier Ballon Bleu as my final watch purchase! I think those two serve different purposes and have a totally different look. If you only plan on one watch, the Panthere kind of falls between TF and BB and would make nice choice! I haven't looked lately but Solo was started as a less expensive line, so I favor the TF over the Solo. I haven't seen the Must in person to really know how the quality compares.