Hmmm... Phrasing? (Where is Rafa when you need him)
They performed quite well and were longer and more pleasant to use in many respects than what I was using.
The only benefit I can think of is that it allows for the simultaneous stirring of two drinks in in separate glasses, with two spoons, which I also saw a lot of. Is there any other reason for the extra length?
Personally I am perfectly content with 30 cm.