You bet. Have been upgrading alot of my customers to the "e" and to date have had great success with no major issues. Besides the range with the 7406 , there has been a some issues with inductive / noise around power etc, etc , but also remember the importance of where the base is located is also a factor, no matter what type of set you're using. The one complain is the stand for the "e" has no slot for an extra battery. In cases where there is heavy use (Cus uses 24 /7) best bet is to purchase the 2 port battery charger as well. (The bats. are good , but nothing lasts for ever).
Enjoy