I've been impressed with how well the gutters worked, and how much you can grow in such a small footprint and what was basically unused space. All that white vinyl fence used to be wooden privacy fence - if it still was I would have 3-4 rows of gutter all over it. Those are 6" aluminum gutter, so basically anything you can grow in a 5-6" pot will grow in there. I'm thinking about putting another few sections somewhere else in the yard for strawberries.
Automatic irrigation of some sort is pretty much a necessity with the gutters, or they will dry out and you'll be out there with a hose daily once it warms up. Mine are filled with moisture control potting mix, and get saturated (holes drilled in bottoms for drainage) every other day right now. If you can keep them wet automatically, they are zero maintenance growing machines. Lots of killer ideas out there if you google for "gutter garden".
@cschaaf That sucks that you didn't get any usable tomatoes. The plants in the self watering pots i built from the FireHouse pickle buckets produced like crazy - especially the eggplants. The tomatoes were all heirloom varieties, hence they get really long and out of control, and eventually start dying off. This winter, I tried something new, and just took 8-10" clippings from a couple of the better producing plants, and stuck them in a little pot of dirt. Sure enough, in a few weeks they rooted so when I took the buckets apart to replant a fresh crop, the clippings became my spring tomato crop. I also just pruned back the eggplants and they took off again with new growth.
I LOVE the self watering buckets. They're ugly, but I can move them to various "out of the way" spots in the yard based on seasonal sunlight differences and plant needs. The key is using good, loose, well draining but spongy potting mix. Mix some organic fertilizer into the soil at planting (and add a little lime for tomatoes) and then just keep the bottom bucket filled with water through the pipe on top.