To be honest with you, i think its doing fairly well
Coralife cost i think cost around $90 for the fixture itself, but it doesn't come with the correct bulb. Bulb cost in nieghborhood of $30+
LFS owner was selling his slightly used fixture for $100 and swapped out the bulb for me for free. Now that's a killer deal and I didn't pass it up.
I am growing almost all the plants I cant grow properly in my 75. Like Bacopa Carolinia Hygrophila Gigantica...even though I am not sure what's the true name of that plant. Also a plant that looks like Ammania Gracilis or Limnophila Aromatica.
I would say go for it, and buy the legs for it for better coverage of light.
Let me know what you decide on though