I used to have heat issues and now my tank stays within a 2 degree range. The fan on the LED units never comes on and power consumption went from 644W to 150W (really 30% of that or 0.3*150W = ~50W). With the apex I can control the blue and white independently, set the percentage for cloud cover, and storm lighting feature. AI Sols are $399.99 a unit (2 required for a 70g) while the vertex illuminas are at least $2,000 (probably way more). Vertex illuminas do look more professional but that is a personal preference. I couldn't agree more with Eugene on if you upgrade to LEDs, you HAVE to buy a unit that is dimmable. Otherwise you're going to have to do acclimation by starting from 1 hour of light and add an additional hour of light every 3 days (1hr day one, 2 hrs day four, etc).