I use it about 3 times a week.  I swam in college and the ones we used then weren't this big but I love the challenge.

The parachute did indeed create abundant resistance, but the chord interfered with my kicking.  Oftentimes,  my feet hit the cord, which made me both uncomfortable and self-conscious about kicking. The parachute is not always centered because its chord slides freely along the belt.

The product itself is good-the line on the parachute twists quite a bit so when you take it off and go to use it again-it takes a second to unwind it.  I bought one for myself and my swim buddy-her parachute first push off the wall somehow ended up getting caught in the lane line and the clasp holding the parachute to the line snapped off.  It was an easy fix-we just knotted the end of the line to the parachute and it works fine without the clasp.  Even though the stretchcordz brand had a faulty clasp-it was a better product-unfortunately last time i went to purchase it they did not offer them so i tried this one.  It works-and does the job-i just have no idea why it twists so much and the other one does not.