Two weeks ago I got two X-15s (front and back). Back one has GPS mapping pack. They are great graphs. I have used them for a while on my team partner's boat. The reason why I went with the X-15 is it`s the best graph you can get that's not color. I fish with a guy that has full color graphs, and in my opinion is they suck. For instance, the front graph you have to angle up and the sun hits it and the sceen looks blank. So how did Lowrance fix the problem? They sell a shield that clips on the front of the graph to shade the sceen. So, now you have to look through a smaller hole and it sucks. The only time those graphs work great is at night, and if you fish like I do it`s 80% day and 20% night. You need a cab on your boat for those graphs to use them for what they are made for. My personal choice is the X-15 with the Gps mapping pack, it`s the same pack for all the graphs. Let me know if you are going to get some new graphs I have some VIF deals with Lowrance that need to be used before they expire, Save some $. Jamie