Before I only buy Dean Markley, D'Addario, Ernie Ball and other Dunlop. When I bought my Jet Lag 100 3 months ago it was mounted with Elixir, and I understood why they were more expensive. For three months after they are always good to play! With all the other brands was oxidation and loss of brightness in one month then change required. Here I do not even know how long they will last another, wear is so slow, it really is top quality. It is very resistant and it has extra sound. In short it is better to buy 1 set at 12 euros which elixir lasts at least 3 months, only 1 set of another brand, usually between 5 and 8 euros, which lasts only 1 month. I can not redeem it in the future, that's it!