Here is my experience and what you need to know going forward with C-Map when it comes to evaluating them. If they have surveyed the lake you are wanting, it is awesome. if they haven't, not so much.

Lowrance gave their prostaff C-Map chips last year at Lake Cherokee at the FLW Tour event. These were their "Tennessee Chips". I was not impressed with what I saw and even voiced my opinion to my boss at Lowrance since mapping and utilizing resources is a major deal for me. As it turned out, they had not completed on the water surveys yet for Lake Cherokee and they were distributed to us to use moreso at the following event at Lake Chickamauga which had already been mapped. Fast forward a few weeks and I got to see it for what it is and what will be when they make your area available. It was incredible! I use every available resource I can to include the Humminbird FishSmart app on my iPhone. The C-Map for Chickamauga was as good or better contour wise than the Lakemaster and the ability to use multiple colors for depth shading was extremely beneficial. I will be the first to tell you that the predecessor maps to their high def surveys aren't worth using(similar to the original Lakemaster charts) however do not judge the product until you use their high def map. Unfortunately, I do not know when Texas will be mapped. Until then, keep running the other resources and don't pass judgement until you get a chance to use their advertised technology.