I changed my 3618 to a 3688, wish I hadn't. The 3618 is easier to use. To me the 3688 is not very user friendly. My main complaint is the edit function, on the 3618 all of the information comes up on one screen. If a channel changes frequencies all you have to do is pull up the edit screen put the new freq in and that's it, none of this deleting a freq and then rescanning. I also don't like the pre programed frequencies because when you scan a satellite that is pre programed with 25 FRs and the scan finds 5 more FRs then it has to check 30 FRs. I have done a blind scan and found a few FRs but have had to wait while it scanned as many as 65 FRs, this takes a lot of time. The positive thing about the 3688 is that the remote from the 922 doesn't interfere with it. My neighbor set up the change for me and it took us a few times to figure it out. Cost me a case of beer, that's why I don't change it back. Maybe I'm a little harsh, but I am learning to operate the 3688 by trial and error, no manual. I have read where a lot of people love the 3688, I wish they would contact me and let me know what they are doing that I am missing. Maybe if I could learn more about I would change my tune. I am an opened minded person and have no problem with somebody telling me that I am wrong, so feel free to tell me what I am doing wrong that makes me hate the 3688 so much. Sorry, had to get that off my chest.