I just got mine in the mail today and I honestly LIKE THEM BETTER. I have used Parelli ropes before and they are nice, my trainer has the Parelli ropes but mine actually work better and are much more comfortable in your hand. I bought the Eye Loop Yacht Lead so that way I can replace my clip or not use one if I'd prefer. :} They are AMAZING.
There is also an Ebay seller that sells Carrot Sticks and Savvy strings. I think you can buy a complete Stick and String for twenty bucks. Same dimensions as Parelli, plus you get a pick a pretty string color. (Training Sticks and Strings)