We've been finalizing production colors for our business and we were interested in Navy Blue so I ordered a spool as well as these samples. We found them to be fantastic (as well as the Navy Blue) as they are well labelled, there are a lot of them, the layer height section is nice and the fact that they are all connected via a strong cable is great.
Based solely on this sample pack, we've decided to check out four other colors for production as well. We wish more filament companies would do this as we're ordering heavily from another company that also makes all their filament here in the US and that offers sample spools on all of their filament. Now we'll be doing the same with COEX.
If you're interested in seeing what their filaments look like once printed then I definitely recommend this sample set. You may be surprised (as we were) at how beautiful many of their colors are in real life.