Great!
I live in the Pacific Northwest where, needless to say, we get very little sun in the winter and my plants are flourishing since my light arrived.  It's well made, the clamp is very sturdy, and I've not had any issue with the lights "drooping" when they get warm.  The timer is awesome and being able to turn one, two, or all three of the lights on is another plus.
Rating: 5 stars