It's a good product...very reliable and environmentally safe. When I had the greenhouses, I used to buy it by the barrel.
Another good product I used to buy was Surflan, which is pre-emergent herbicide. Once you get your garden clean and your plants planted, you can overspray with this stuff, and it will prevent seeds from germanating. There are other similar products, usually in granular form, available in your local garden center, and they are worth the investment...unless you like to pull weeds.
One more word about weeds: Mulch! It helps to keep the moisture in and the weeds out. I use 6-8" of straw on my vegetable garden, and about 4" of shredded wood mulch on my perrenial bed. Anything right next to your house needs to be cedar or cypress, so as not to invite termites.
By the way, I had one lonely morel mushroom come up in my perennial bed from the mulch we put down last year. It should have been left to propagate it'self, but my yard man picked it and brought it in, so we sauteed it with some fresh asparagus last night.
Strangely, I always enjoyed pulling weeds on a nice day. I'd get out my little stool and a 5 gallon bucket, find a spot in the garden, and clean up everything within reach before I moved. Even now, with my bad back, I can do a little bit, as long as I bend forward and not sideways.
There's something about getting my hands in the dirt, feeling the sun on the back of my neck, and listening to the sounds of nature that does my soul good.