MyMobiler connects automatically whenever I cradle the phone, I have to start the Viewer. MyMobiler doesn't require "enhanced network functionality" which causes flakey connections on my boxes, YMMV. I use MyMobiler to do installs, it is easier to hit the buttons with a mouse instead of a stylus. With MyMobiler, after the install you can see what the program is going to look like on your phone, where you will be looking at it 90% of the time, rather than what it will look like when you hook up your Redfly.
The only real advantage to Viewer is it gives me the same view as I have if I connect to my C8. It also has all the disadvantages of the Redfly with not being able to view the wallpaper, Spb products are distorted, some programs don't display at all. I love my Redfly and when I'm away from my computer it is wonderful, but MyMobiler wins hands down for me on the desktop.