as i understand, when using multi flex, if you have for instance, a desktop and an ipad or iphone connected at same time you should see on screen the name of other device connected, or at least it showed it in the video that matt done at orlando. Not seeing any indication of there being 2 devices connected except on the slice button that is grayed out on my 6400. also have noticed that when both connected you can listen to two bands but you are restricted to 1 antenna for both devices. or in other words, if im listening to 20 and 40 and have 2 antennas connected, i cant select the receive antenna for each band. when i do go into transmit i do see the TX button change which is and indicator. still confused, looks to me like its not that beneficial on a 6400. maybe i just dont get it, how 2 can operate and the advantages of multiflex besides sharing one tx antenna, sorry for long post, dont misunderstand! i love my 6400 and dont regret buying ot, just dont fully understand the mulitflex part, maybe some one can do a good video in the near future. thanks!