I am not sure what to say really. For me, these bands work exactly like they're supposed to. The only trouble is I have to do all the work, and I have to be motivated enough to work it at least 3-4 times a week. If I don't use it, I won't get or see any benefits whatsoever. I can blame the product and say it doesn't work correctly or because it feels cheap, or the texture is not to my liking, or the color choices are wrong or I can stretch it enough to break it.What's important to me is, do they work as advertised if I work out with them (or anything else for that matter). I don't expect them to give me a Schwarzenegger like body, and if your anything like me, just getting the motivation to work out at all is where I usually fail.
I've belonged to two different fitness center, I also have a multi set of dumbbells, hand grips (the squeezy things), and tennis balls. I also had one of those all in one rubber band bench press, leg lift multi use things. It was great. I kept it in the living room so I would always use it. My 9 year old daughter ended up using it more than I did for her dolls. So my point is for 20 bucks you get a product that I think is built well and will last a lifetime if you don't abuse it. BTW, I bought mine in January 2017 and only today I opened it and used it for for the first time. I am happy with this purchase and there is some YouTube videos that can help guide and motivate you. Use it or lose it.

*SAFETY WARNING*
Check the stitching on the leg strap before using it. Mine attaches the D ring to the strap with a single stitched piece of fabric that ripped right off during my first use with 20lbs. I advise the company to create a better leg strap because this can be dangerous under pressure. When my strap broke, the bands shot back and hit the wall with all the clips attached and ended up knocking paint off my wall and leaving a small dent. If your leg strap only has 1 row of stitching holding it down then don't use it, it will rip.

Safety issue aside, I am currently enjoying this kit. I bought this in the effort to lift from home without having to spend loads of money on dumbells. I use the door harness which as of right now, after 2 days of use seems secure. However I don't think I will ever shake the feeling that any second part of my door could break and I'll have parts flying at me. As I said, I said I bought this with the intention of replacing dumbells, it can be difficult to get a complete workout because you always have to find sturdy locations to anchor it, but I did notice that after workout I felt that i had worked muscles that dumbells alone would never hit. Resistance training feels like its more beneficial to take your time with your reps as the tension builds as you stretch the bands. In conclusion, I am happy with this as a inexpensive alternative to dumbbells and will continue using it, but watch out for that ankle strap.

WARNING!!! This works better than advertised.
When I was searching for resistance bands on Amazon, I normally go for the highly rated ones, holding that other customers could steer me one way or another. With such great feedback on the Black Mountain branded bands I was certain I was getting a good product. What I wasn't expecting was an great one. I have these bands set up in my garage and work out 4-5 times a week and they stood up to my workouts. But I also have a group here twice a week and they have nothing but positive things to say about them.
My wife isn't a huge fan of free weights because she's afraid she drop on her toes. With these these super sturdy and super deceiving on how durable they are.
I'd highly recommend them to anyone, particularly those who has limited space.

I've been a happy user of these bands for four years now. A week ago, I noticed that one of the bands (my yellow band) had a tear in it. I've used them for several years, so I wasn't particularly surprised or upset (hey, stuff wears out over time).. So, seeing the lifetime warranty, I took a picture of the ripped band and emailed customer service. The VERY NEXT day, they had shipped a replacement band to me, no questions asked. Terrific customer service.

For me, these bands aren't a replacement for gym equipment and actual weights, but for traveling, they are a perfect solution. Lightweight, convenient to use and they keep me in shape during my travels from the comfort of my hotel room.

I had lost overall body strength due a painful hip injury that really hampered my mobility and limited my ability to exercise. I've recovered from surgery and I'm now catching up on recovering strength using this product. I feel that the continual and steady resistance the bands provide through the entire exercise motion is more efficient in strengthening the targeted muscles than free weights. Steady resistance is much harder to maintain with free weights. Even at light resistance, these bands provide that steady pressure that can be increased as the muscles strengthen, plus you can hold the pressure at any point during the motion simply by stopping for a count of 3 or 5, etc. This works great, for example, on bicep curls if you hold on the return motion when your elbows are at 90 degrees; makes you feel the burn! This system is allowing me to regain strength slowly, easily and steadily. The bands, the couplings, the handles, etc., are all well-designed and made of high quality materials. Very well-satisfied with the quality of the product and the efficiency of the system. A big plus is that the set and the system travel very well!