I upgraded from gen 1 to the Pros in October and am happy with the lights.
Things that I like about the Radion lights:
1. The blubs do not degrade, or become less effective, over 6-9 months, which gives the tank inhabitants a nice consistent light source.
2. The ability to adjust the light intensity for different times of the day and other programing features such as: traveling sunrise/sunset, moon phases.
3. They don't generate a lot of heat in the room and they are quiet.
4. The electric bill is cheaper than with some of the older lighting technology.
5. Customer support is top notch.
6. The option to change the lens to get a wider spread.
Things that I don't like:
1. The web interface to control the lights can be flakey, but they have worked out most, if not all the bugs.
Things I look forward to:
1. Setting up Reef Link which will allow me to control the lights wirelessly. (Soon you will be able to control their pumps as well)