this is great for taking her for a walk

Pros: great for a walk

Cons: none

Good product for some dogs, especially on hikes. But not for dogs who are learning to walk properly on a leash or are extremely strong and need leash training.

Pros: fairly durable

Cons: not good for dogs in training

I know that it isn't the best well for training, but I still like these when walking my dogs.

Pros: gives them more freedom

Cons: doesn't work when training

It's a great leash, there's no doubt about it. The handle is a bit large and hard to use, but it can handle a big dog well. My biggest issue with retractable leashes is that people use them wrong, they kind of give the illusion of control. They can run 360 degrees around you with it fully stretched out and get into a lot of trouble! I use mine when I let mine run in a foot ball or base ball field, that way I know there's no way they're going to encounter cars or other animals walking up a trail (which has happend to me).

Pros: Strong, and convenient

Cons: Often used wrong

I recently bought two flexi leashes with the belt style for larger dogs up to 110 lbs I think it said; I have used this style of leash for almost 7 years.
I like the longer belt style as opposed to the cord because it gives me more durability with large dogs like labs. I walk two at a time and I like the grip where you hold the leash. I also think that the cord is easier to get tangled up with branches or with the other dog's leash. The belt style seems to be easier to get untangled. I like the longer leash because it gives my dogs more roaming ability. For training value , I would use a regular leash unless you are doing a "stay" in the midst of a park where you do not want them to run off.
I recommend it for all owners who like to take their dogs on walks. It comes in sizes to accommodate all sizes of dogs.

Pros: the belt style and the length gives more roaming ability to dogs

Cons: dogs can chew through the leashes