I purchased this to use with my 10 month old 75lb. Weim.  My dog is a puller and I have tried numerous leashes/harnesses to make walking her easier with varying degrees of success.  I found that she gets most excited when we're on a  trail and that's when she pulls hardest.  Even with the retractable leash, she'll take off running so fast and hard that it would snap and yank my arm almost clean out of its socket.  I figured it was easy for her to wreak havoc on my arms because they're not the strongest, but she'd have a terrible time pulling against the trunk of my body.  The first time I used this while out on a trail with her and she took off running, the belt part snapped against my sides and she was actually able to pull me up and down hills.  Still, it's better that she pulls against my full body versus my one arm.  This leash system seems pretty durable and does make walking her on trails easier, but if you get this, especially for a larger dog, you MUST also get the Lunge Buster.  This leash, while good, is kind of short, and I like to give my dog a little more distance.  The Lunge Buster doesn't stop her from snapping the leash and pulling me around, but it does take a little of the whiplash out.  Walking her hands-free is also pretty nifty, but it does get a little hard at times to reign her in when another person is walking toward us.  I have to wrap the leash around my hand a few times to shorten it and is not the ideal way I'd pull her closer to me.  The purple color is nice and bold, just like any other purple leash/collar  and goes well with her silver coat.