There is nothing 'wrong' with this set, as I should've done my homework before placing the order. Now that I have the set and am able to see it on, I personally find that the length difference between 30" and 20" is significant and that the 16" is too short to wear around my neck, but looks OK doubled around my wrist.

The chains seem sturdy, and the 'o' rings are both soldered to either end of the chain - this may be a bit of a problem down the line, as this is probably where the chain/s would be likely to break. The chains are delicate, the clasps are round and on the small side to complement the chain size, so may not be easy to manage for some.