I bought my first Nite Ize item, a clip-on light for my dog's collar, some years ago at a pet store. It was too bulky for my small dog's collar and had to be taken on and off constantly, so I eventually used it as a keychain light instead, and it lasted years. Soon I started to see the brand everywhere, and I have acquired quite a few of their products, both for my dog and other uses such as camping and tie-downs. It's a great brand with well-made products. However, their attention to pet safety sold me on the brand. I saw this leash before buying it, and I've also seen their light-up ball and frisbee in action at the dog park; all are equally impressive. My favorite product so far is their rechargeable, LED, glowstick-looking light-up pet collar, another item I saw in action before buying, on two cats being walked in the evening after all the mischievous dogs had gone to bed. The collar is an excellent addition to our night-time walks and helps me locate my pup at the dog park after dark, but I need something more substantial since not every street in our neighborhood has sidewalks. The leash is simple but executed well, and the quality is excellent. The LEDs are very bright, without disturbing my eyes or bothering my pup, with the choice of blinking, solid, or no lights with the push of a button. It only comes in one size so far, so it is a 1" thick leash, larger than I typically buy for my 12 # dog, but since it's for safety purposes, I prefer it. I cannot vouch for its reliability or durability yet, as I've only had it a couple of days, but the collar has lasted almost a year of nearly daily use and still looks and performs like new. There's a well-made battery holder under the hand loop where you charge it and turn on/off the lights with a small button. An attached silicone stopper protects the charging port. In my experience with all light-up Nite Ize products, the charge lasts a couple of weeks with 1-2 hr/day use, though I will update this review if anything is different with this leash. A tip I've learned that will help extend the battery life of anything rechargeable is to only leave it on the charger until charged. Leaving things plugged in indefinitely or even overnight weakens the battery. My only concern about the leash is cleaning it. I live in a small urban apartment without much room between my front door and sofa, or bed for that matter, so keeping a clean home means being extra particular. I throw my dog's leashes and collars in a garment bag and run them with a load in the washer then air dry, every few weeks. This leash should be easy enough to clean with a good wipe-down without damaging the lights or battery. If not, I'll update the review.