Have worked flawlessly since they were installed well over a year ago.  They were easy to install as replacements for unlighted post caps.  Lights stay on through the night and look quite pretty when lit.  They are very well made and we are extremely happy with our purchase.

Pros: Made of sturdy aluminum....NOT PLASTIC!  Bumps and taps won't affect them and they won't get that faded look over time.
Cons: Pricey....but quality rules!