Well, I was going to buy the PC3 this weekend until I talked to fuelmoto. They said that the PC5 will be out in a month for the 700xx. They said the advantage is half the size and the fact that you can store two settings on it and switch between the two. They also said that the sensor can be purchased to dial it in for you. The sensor can be used to create the map for you and then you can remove it. The key to this is that.......here is an idea......some of us could pitch in and purchased the sensor to get our quads dialed in. This would help keep the price down for all of us. (just an idea to kick around). I also asked him if they were going to have a rental option on the sensor.... I don't think they ever thought about that..... It sounded like possibly a light bulb went on..... So I decided to wait for the PC5.