PROS;- Works extremely well. I work at a pet store for a living and regularly recommend the Easy Walk harness for dogs who pull or lunge. I've had nothing but good reviews from people I've sold it to, too.- Reversible, so really nice if you occasionally need a back-clip harness as well.- Works essentially the same as the "regular" Easy Walk harness, with added padding for comfort. A major deciding factor for me was the reflective stitching on the Deluxe version.CONS;- The strap that goes behind their legs is padded, but not entirely so. Unfortunately, the way it fits my dog makes it so that the buckle is directly beneath one of her arm pits (leg pits?), which I fear isn't so comfortable. This hasn't been an issue that's come up, and doesn't seem to bother her, but that is something I'd watch for with a more sensitive dog.- Not inescapable by any means (but honestly, no harness is). The front has a martingale-esque design that tightens when the dog pulls. This is nice, but helps more with pulling than it does with security. If your dog is pulling backward, it will be able to slip out given enough time. This is easily preventable, aka don't pull your dog towards you if it's pulling back, it will likely slip out, but this hasn't been an issue whatsoever with me walking my dog. This IS an issue, however, when other people walk her and don't keep this in mind.- The front clip part has been consistently too big/loose on my dog, even while the rest of the harness fits perfectly. This is not a sizing issue as it otherwise fits perfectly, and we've had her fitted for easy walk harnesses in person before (I just wanted to purchase the cute blue one, haha). The design would work so much better if this front part were smaller or more adjustable than it is.WHAT TO KNOW;- These run a bit big compared to the sizing of many other harnesses. Measure your dog before purchasing of course, but do keep that in mind.- The medium vs the medium-large's biggest difference is the thickness of the straps themselves. For a heftier breed that needs stronger reinforcement on a harness, go medium-large.- A few people have complained that their animals have bitten through the harness... This is a comment that frustrates me because it is an entirely preventable issue. Pretty much any harness can be chewed through by a dog if it is left alone with the harness on. It is extremely sturdy. Never leave a harness on a dog unless you are walking it, or you are actively supervising it. If your dog chews out of its harness after being left alone with it on, that's on you and is definitely not an indication of the product's quality. While using it correctly, they've lasted me years with my pup.- Lastly, if you've never used a front clip, there is definitely a learning curve for both you and your pup. The first two or three walks will be a bit awkward, so don't be discouraged if it doesn't immediately come naturally. That said, you should immediately notice a difference in pulling; if you have a very strong dog, this is a great product for being able to easily control your pup.