For eight years, my two boxers have had their Flexi leashes and they have kept perfectly in all situations! Now the retreat was a bit slow ... but since you can not complain after such a long time and daily hand! That's why I reappointed me two of these Flexi leashes, from the quality I think they just got better, because you hardly feel the train now and the whitish cord I find much better!
The only thing we had to get used to, is that the new Flexi leashes are now only 7 meters long, but it is the dogs got used quickly and not walk pure as the first few days: o)
Again and again, Flexi, I can only say ... great alternative in areas where you can not run freely the dog should or !!