My first receiver was a 2000, looked like the picture above I believe. I got a 2700 sometime after for the second room, and replaced the 2000 with a 4700. Both the 2700 and 4700 got software updates and they were called a 2900 and 4900. I had those for several years. The 2900 was upgraded again I don't remember to what number. It was a big deal when I got the 501/508/510 receivers. Recording TV shows!! My next and current receivers are the 612's, after some problems initially, they have become rock solid, each lasting many years before I finally just had to replace one.