Oh yeah...everyone....and I mean all the KNOW-IT-ALLS say the SDS100 and 200 are the same as the 436 and 536. I say they are full of it. Some of it-maybe. Really makes me wonder if they have one of these scanners....probably the ones saying it are the ones that have NOTHING positive to say about anything. These forums are a haven for them. I say let them make an instructional book (Mark's scanners) and make US OWNERS happy. Yeah I did look through the Uniden booklet. Nothing much to say except what a scanner does and how to install one in a vehicle. Meanwhile I am trying myself not to make any mistakes in programming....