Thoughts on Font of Life?

I used to like the precursor to Font of Life, I forget what it was called but it was 2.5% max health as healing to your ADC. Font of life is only 1%, the value never really reaches impressive levels with the highest I've gotten being a bit over 4,000. 4,000 is a tank's full health bar or two ADC health bars, for a 30+ minute game that's not impressive. That's actually miserably low and that's the highest.

Your thoughts? how do you rate the Font of Life rune ?

Also yes I know that there is a gimmick that causes FoL to trigger ardent censer.