I agree with Mike. The MX800 issues were tied completely to the RF200 unit. I used to just buy an RF250 to use with all the MX800s. The new one, MX850, comes without the RF unit and lets you purchase the RF250 if you need it. That means my customers who need a his and her remote setup and only need one RF unit, don't get stuck with an extra RF unit. I like the change in the up/down/enter selection buttons and I do like the better light.