Due to very old and clogged french drains on my property, my patio flooded with every storm and the water didn't fully drain off for many hours. So, I resolved to fix it. Hours later, completely drenched in sweat after the back (and hand) breaking work pick axing through gravel to get to and remove all of the old pipe, I was ready to install the new pipe.
The flex drain fit my trench perfectly and followed any turns necessary easily. It was easy to stretch to the exact length I needed and it was easy to cut as necessary. I tied off both ends of the sock to prevent silt from clogging them, buried one end 4' down into a gravel lined dry well I dug and covered all of it up with gravel.
After all the hard labor involved in the first part of my project, I was relieved to have the Flex-Drain pipe be so convenient and well made. Unlike the negative poster here, I could clearly see in the product name that this was a perforated drain pipe so I was not shocked by the presence of hundreds of small holes and subsequently compelled to give a perfectly good product 2 stars for my mistake.
For DIY landscaping projects, you won't find an easier drain pipe to use.