What I've quickly discovered in buying so many no name products is that one of the ways they cut corners is in packaging.
The re-sealable seals don't work, the caps sometimes leak, and it's better to just cut bags open rather then try to pull them apart. Little things that have been improved in packaging on say, a bottle of lemon juice (the cap has a flip top with a little hole to squeeze it out of) aren't there on the no-name (just a screw top). Clearly, these are the conveniences we are paying those few extra cents/dollars for.
Are they worth it? I'm going to go with no. As long as you pay attention and use other means of closing things, it shouldn't be an issue and the savings are good.