The ease in which you can connect your devices. You don't need any additional hardware or other programs for connecting them with teraterm as it supports multiple protocols like serial port (RS232), TCP/IP network connection etc., I have no dislikes about this program because there are so many things that i liked such as its compatibility across platforms whether windows OS's & Linux operating system. There should be some sort of improvement regarding speed especially when we use our mobile phones through USB cable connected over internet then sometimes it takes too much time if using via LAN connections. This will help alot since my work requires me frequently switch between these two modes while working online at office hours but by implementing this feature now switching becomes seamless without lagging issues!