I just recently bought the Satellite LED+ for all three of my tanks. I am still waiting to receive them, but I will pass along what sold me.
Yes, there are some cool features like the storms and cloud cover, but those are really just for play therefore you probably won't use them all that much. The key is the ability to actually control the color of light over your tank. I am sure the Beamswork are wonderful lights for the price (possibly a better "bang for the buck"), but you cannot control the color and some people end up with a washed out tank and fish. With the Satellite LED+ you can control the fixture so that doesn't happen.
The real thing that sold me was the ability to do sunrise and sunset with the LED+. It requires the "ramp-up timer," but having bright lights immediately just turn on always bugged me because I know fish don't like it - supported by the fact that my fish always scattered whenever the lights turned on or off.
I also saw some pictures from another member on here (unfortunately don't remember who it was and can't find the thread). He put a 48" fixture on his six foot 125g tank. While the LED+ did not fill the entire tank with light, it filled all but the very edges very well, leaving only the edges a bit darker. I personally like this because it allows the fish to leave the bright light which seems to help them feel more secure at times. If I find I want more light, then I will add another LED+.
With a 55 gallon you have the option of getting one light to cover your entire tank. That is probably the route I would go (if I was in your shoes) because you can control the light intensity with the remote.
To finish, I will be posting my own review thread once I get my lights and get set them up. Unfortunately my tanks are not currently set up due to just moving into my house, but I will do my best and then update once the tanks have water (can't come soon enough).
