Works great; easy to install. Have had it on my porch for 3 seasons and it's worked flawlessly. It survived 2 New England winters outdoors, with a few very minor repairs. This year, I set it up, left the next day, came back 3 weeks later, and all the plants are thriving. In fact, they seem to be in better shape than when I was watering by hand.
We've been using one of these to keep outside plants watered when we're not around. There's a timer that turns the water on twice a day and then a series of small plastic tubes you cut to size that drips water to each plant. It took about half a day to cut and assemble the tubing to reach all the plants, but it's held up through several seasons of freezing winters and hot summers without problem.
I've used this system for years and have mostly been really happy with it. Also kinda fun to set up- like tinker toys in the garden. Like Tom, my kit has held up well through winters and summers. Only gripe: sometimes end caps pop off, creating a mini free-flow/flood in one hose area and a resulting reduction in pressure everywhere else in the system.
Some other random odds and ends I've learned after using this for a while: It takes some trial and error to get the drip outlets in the right spots to uniformly water planter boxes of flowers. I also wish there was an even shorter duration on the timers since the minimum of 15 minutes is too much water. But, it beats the alternative of having to be there every day!
If it works - I plan on having planter boxes of everything that I need to make homemade salsa. So I'm looking for a good watering system -- in that past, that's been one of my downfalls. But if I'm successful, I hope to have so much salsa that I have to give everyone I know a bottle. :)