Have used 4-5 times in workouts and what I like most are the number of bands, and the fact that there are some easy baby level bands in there for wimps like me.  Those exercises I tried and failed at because the bands were stronger than an ox and my noodle arms are not ox like at all...well, the little yellow and blue guys in this pack are FANTASTIC.  I can work out with the big boys now.  Not five stars since don't know how hold up over long time, but that's a minor thing, and shouldn't deter you from dropping the very minimal amount of $ they charge for these.  Like the carabeeners since it makes combining the bands easy.  I even used handles from another set - just clipped them on and done.  Don't over think this - it's got a billion and one positive ratings, and if you are starting out like me, this has enough resistance to get you kicked off.