I had a tech onsite to replace my 3400 that the expander has not worked properly for over a year and after more than 1/2 hour of updating firmware the guide started with days of information, that was good. Then he tried to go into the user settings the old way (including the Motorola information included in the box) with powering off and pressing menu on the remote within 2 seconds and it broke the box. He was also not able to go into what he called the "diagnostic" settings as well. It turned on with the same look as normal but the "ok" and "menu" buttons flickered on the front but no longer did anything. The only way to get the box working again properly was pulling the power (something I am very familiar with from the 3400 and expander). It looks like Shaw changed that operation and incorporated some of the settings in the "options" selection from the menu while powered on but if you try to go the other way it breaks it. Now some very disapointing information: the new guide is lacking features that the old one had, the most important being the ability to see other times and channels a show is available by "info" "view upcoming times for this title" from the guide. I was unable to find any way to do this in the HD guide. I also do not like not being able to record from the guide by pressing the "record" button on the remote without it bringing up a second menu asking what options you want to use for the recording. The biggest problem we have with the 3510 is the closed caption options. Both the 3400 and the old 3416 had settings for size,style,color and much more and now the "new" one only lets you see the CC as black background with white letters (but they actually look more grey and do not look good). I do not know if this is Shaw only allowing some of the settings or if Motorola changed it as there seems to be no way to go the the user settings from the power off - menu within 2 seconds to see. There is a bad delay at times trying to use the guide as already reported but I do find watching recorded shows using the forward and jump works better than the 3400. The new HD guide also only shows the old SD channels but only allows you to go the the HD version. I do not like that as it is very confusing. So what was channel 208 (Fox East HD) is now channel 82 (old Fox SD) but you are displaying you are watching channel 82, not 205. I know there were some channels that were showing different time feeds for SD and HD so I am not sure if you can do that anymore. I have the 1TB expander attached so time will tell if the Shaw introduced issue on the 3400 of always losing the connection to it or having the unit lock up is gone. Overall I am not happy with the 3510 and hope Shaw will get the issues corrected and not ignore them like they have for the 3400.